Two units of Beechcraft TC-90 training aircraft from Japan Ministry of Defense (JMOD) taxiway at the runway upon arrival during a transfer ceremony of the aircrafts to the Philippine Navy at the Naval Air Group (NAG) headquarters in Sangley Point, Cavite city, south of Manila, Philippines March 27, 2017. REUTERS/Romeo Ranoco

Philippine Navy band play music to welcome the arrival of two units Beechcraft TC-90 training aircraft from Japan Ministry of Defense (JMOD) taxiway during a transfer ceremony of the aircrafts to the Philippine Navy at the Naval Air Group (NAG) headquarters in Sangley Point, Cavite city, south of Manila, Philippines March 27, 2017. REUTERS/Romeo Ranoco

A plane prepares to take-off from a dirt road used as a makeshift runway during the Vintage Air Rally at the Nairobi national park in Kenya's capital Nairobi, November 27, 2016. REUTERS/Thomas Mukoya

Alpha Jet planes are lined up on the runway before taking off for the Bastille day parade on the Evreux airbase, July 14, 2016. REUTERS/Philippe Wojazer SEARCH "BIRDS BASTILLE" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES.

FILE PHOTO - EgyptAir planes are pictured parked on the runway at Cairo Airport, September 5, 2013. REUTERS/Mohamed Abd El Ghany/File Photo

Aircraft of Philippines Airlines (PAL), the southeast asian nation's flag carrier, taxiing at a runway of the Ninoy Aquino International Airport (NAIA) in Manila March 14, 2016. REUTERS/Romeo Ranoco

Aircraft of Philippines Airlines (PAL), the southeast asian nation's flag carrier, taxiing at a runway of the Ninoy Aquino International Airport (NAIA) in Manila March 14, 2016. REUTERS/Romeo Ranoco

Aircrafts of Philippines Airlines (PAL), the southeast asian nation's flag carrier, taxiing at a runway of the Ninoy Aquino International Airport (NAIA) in Manila March 14, 2016. REUTERS/Romeo Ranoco

An aircraft of Philippines Airlines (PAL), the southeast asian nation's flag carrier, taxiing at a runway while other aircrafts park besides the hangar of the Ninoy Aquino International Airport (NAIA) in Manila March 14, 2016. REUTERS/Romeo Ranoco

Aircraft of Philippines Airlines (PAL), the southeast asian nation's flag carrier, park beside a hangar at a runway of the Ninoy Aquino International Airport (NAIA) in Manila March 14, 2016. REUTERS/Romeo Ranoco

An aircraft of Philippines Airlines (PAL), the southeast asian nation's flag carrier, takeoff at a runway of the Ninoy Aquino International Airport (NAIA) in Manila March 14, 2016. REUTERS/Romeo Ranoco

A German airforce Airbus A400M military aircraft takes off from the German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer

A German airforce Airbus A400M military aircraft taxis along the runway at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer

A German airforce Airbus A400M military aircraft taxis along the runway at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer

Army personnel board a German airforce Airbus A400M military aircraft at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer

Army personnel board a German airforce Airbus A400M military aircraft at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey's Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer

A German airforce Airbus A400M military refuelling aircraft taxis along the runway at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey?s Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer ( - Tags: TRANSPORT MILITARY)

A German airforce Airbus A400M military refuelling aircraft taxis along the runway at German army Bundeswehr airbase in Jagel, northern Germany December 10, 2015. The first the German air force Tornado reconnaissance jets will take off for Turkey?s Incirlik air base on Thursday, to support the military campaign against Islamic State. REUTERS/Fabian Bimmer ( - Tags: TRANSPORT MILITARY)

A Metrojet airplane lands at the airport of the Red Sea resort of Sharm el-Sheikh, Egypt November 10, 2015. The fallout from the crash of a Russian Metrojet passenger plane in Egypt's Sinai Peninsula could slash tourism income from Sharm al-Sheikh by half, the head of the region's travel agents' association said on Tuesday. Several airlines have suspended flights to the Red Sea resort since the Oct. 31 crash, which investigators and Western governments believe was likely to have been caused by a bomb. Thousands of Russian and British tourists have been flown home. REUTERS/Asmaa Waguih

A Russian emergency ministry cargo plane carrying the bodies of victims of a Russian airliner, which crashed in Egypt's Sinai Peninsula on Saturday, lands at Pulkovo airport in St. Petersburg, Russia November 2, 2015. The Airbus A321, operated by Russian airline Kogalymavia under the brand name Metrojet, carrying 224 passengers crashed into a mountainous area of Egypt's Sinai peninsula on Saturday shortly after losing radar contact near cruising altitude, killing all aboard. REUTERS/Dmitry Lovetsky/Pool

U.S. Air Force F-16 Fighting Falcon fighter jets stand on tarmac at the Spangdahlem Air base, Germany September 3, 2015. REUTERS/Ina Fassbender

Two U.S. Air Force F-16 Fighting Falcon fighter jets stand on tarmac at the Spangdahlem Air base, Germany September 3, 2015. REUTERS/Ina Fassbender

A U.S. Air Force F-22 Raptor fighter jet taxis on tarmac at the Spangdahlem Air base, Germany September 3, 2015. REUTERS/Ina Fassbender

A U.S. Air Force F-22 Raptor fighter jet taxis on tarmac at the Spangdahlem Air base, Germany September 3, 2015. REUTERS/Ina Fassbender

Two U.S. Air Force F-22 Raptor fighter jets taxi on tarmac at the Spangdahlem Air base, Germany September 3, 2015. REUTERS/Ina Fassbender

A U.S. Air Force F-22 Raptor fighter jet taxis on tarmac at the Spangdahlem Air base, Germany September 3, 2015. REUTERS/Ina Fassbender

A Philippine Airlines (PAL) aircraft taxis on a runway at Manila International Airport September 3, 2015. Philippine Airlines Inc (PAL) said on Thursday it is laying off 117 domestic ground crew, or about 2 percent of its total staff strength, in November to focus on its core operations for sustaining profitability. REUTERS/Romeo Ranoco

A Philippine Airlines (PAL) aircraft taxis on a runway at Manila International Airport September 3, 2015. Philippine Airlines Inc (PAL) said on Thursday it is laying off 117 domestic ground crew, or about 2 percent of its total staff strength, in November to focus on its core operations for sustaining profitability. REUTERS/Romeo Ranoco

A Philippine Airlines (PAL) aircraft takes off from a runway at Manila International Airport September 3, 2015. Philippine Airlines Inc (PAL) said on Thursday it is laying off 117 domestic ground crew, or about 2 percent of its total staff strength, in November to focus on its core operations for sustaining profitability. REUTERS/Romeo Ranoco

The FireFlight UAS TwinHawk is carried to the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon

A pair of Griffon Aerospace Outlaw G2 stand on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon

A Griffon Aerospace Outlaw G2 lands on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon

A General Atomics MQ-9 Reaper stands on the runway during "Black Dart", a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. REUTERS/Patrick T. Fallon

A security guard cycles near an Airbus A350-900 aircraft during its delivery ceremony at Noi Bai International Airport in Hanoi July 2, 2015. This is the first Airbus A350-900 to be delivered of a package of 10 aircraft, ordered by Vietnam Airlines for delivery by 2019, making the airline the second in the world after Qatar Airways and the first in Asia, to have bought this kind of aircraft. REUTERS/Kham

Crew members push the solar-powered plane Solar Impulse 2 to its hangar at Nagoya airport after changing weather conditions thwarted a planned take-off, June 24, 2015. The solar-powered plane attempting a round-the-world flight cut short the seventh leg of its 35,000-km global (22,000-mile) journey earlier this month, landing in Nagoya, western Japan, due to bad weather. REUTERS/Thomas Peter

A Bombardier CS300 aicraft takes off to participate a flying display as an Airbus A380, the world's largest jetliner, waits on the taxiway during the 51st Paris Air Show at Le Bourget airport near Paris, June 16, 2015. REUTERS/Pascal Rossignol

A Bombardier CS300 aicraft takes off to participate a flying display as an Airbus A380, the world's largest jetliner, waits on the taxiway during the 51st Paris Air Show at Le Bourget airport near Paris, June 15, 2015. REUTERS/Pascal Rossignol

Light aircraft prepare to land at Campo de Marte airport in Sao Paulo April 12, 2015. REUTERS/Paulo Whitaker

A Germanwings Airbus A320 registration D-AIPX is seen at the Berlin airport in this March 29, 2014 file photo. An Airbus plane operated by Lufthansa's Germanwings budget airline crashed in southern France on Tuesday en route from Barcelona to Duesseldorf, police and aviation officials said. Picture taken March 29, 2014. REUTERS/Jan Seba TPX IMAGES OF THE DAY

An Airbus A310 of Iranian private airline Mahan Air is seen at Sanaa International airport following its first flight to Yemen from Iran, in Sanaa March 1, 2015. Yemen and Iran signed a civil aviation deal on Saturday, Yemeni state news agency SABA reported, a move that may reflect Tehran's support for the Shi'ite Muslim militia that now controls Sanaa. The deal signed in Tehran by the aviation authorities of both countries allows Yemen and Iran each to fly up to 14 flights a week in both directions, SABA said. REUTERS/Mohamed al-Sayaghi (YEMEN - Tags: BUSINESS TRANSPORT POLITICS)

A Learjet prepares to land at Congonhas airport in Sao Paulo February 12, 2015. REUTERS/Paulo Whitaker (BRAZIL - Tags: SOCIETY TRANSPORT BUSINESS TPX IMAGES OF THE DAY)

An unmanned aerial vehicle is pictured on a runway in front of the Federal Police during a media presentation at the airport in Iguala, in the southwestern state of Guerrero, October 31, 2014. According to the police, the drone will be used to help in the search for 43 missing student teachers, who disappeared last month and are feared massacred in Iguala. REUTERS/Henry Romero (MEXICO - Tags: CIVIL UNREST CRIME LAW MILITARY)

The wreckage of what is believed to be Christophe de Margerie's Dassault Falcon jet is seen at Moscow's Vnukovo airport, October 21, 2014. De Margerie, the charismatic and outspoken chief executive of the French oil company Total, was killed when his private jet hit a snow plough as it was taking off from Moscow's Vnukovo airport on Monday night. REUTERS/Maxim Zmeyev (RUSSIA - Tags: DISASTER TRANSPORT)

U.S. Secretary of State John Kerry speaks on his phone while his plane refuels at Ramstein Air Base in Ramstein-Miesenbach August 1, 2014. REUTERS/Lucas Jackson (GERMANY - Tags: POLITICS)

Coffins of the victims of Malaysia Airlines MH17 downed over rebel-held territory in eastern Ukraine, are carried from an aircraft during a national reception ceremony at Eindhoven airport July 23, 2014. Two aircraft carrying the remains of some of the 298 passengers who died on flight MH17 touched down at an airport in the Dutch city of Eindhoven on Wednesday, as next-of-kin and Dutch and foreign officials looked on. The remains of the victims of the downing of the flight over eastern Ukraine, 193 of whom were Dutch, will be brought over the next few days to a military base in Hilversum, the Netherlands. The Netherlands declared Wednesday the country's first day of mourning in more than half a century. REUTERS/Toussaint Kluiters (NETHERLANDS - Tags: TRANSPORT POLITICS DISASTER CIVIL UNREST TPX IMAGES OF THE DAY)

A wreckage of a burnt aircraft is pictured after a shelling at Tripoli International Airport July 21, 2014. Heavy fighting erupted on Sunday around Tripoli International Airport, where rival militias have been battling for control, killing at least four people and forcing thousands from their homes, local residents and witnesses said. REUTERS/Hani Amara (LIBYA - Tags: POLITICS CIVIL UNREST TRANSPORT CONFLICT TPX IMAGES OF THE DAY)

A damaged aircraft is pictured after a shelling at Tripoli International Airport July 15, 2014. The airport sustained extensive damage after coming under shellfire which killed two soldiers, knocked out the control tower and damaged 90 percent of planes parked there. The airport area is under the control of former fighters from the western town of Zintan who have held it since the fall of Tripoli in 2011. Rival Islamist-leaning militias fought with the Zintanis in recent days but failed to dislodge them. REUTERS/Hani Amara (LIBYA - Tags: POLITICS CIVIL UNREST CONFLICT TRANSPORT TPX IMAGES OF THE DAY)

An airplane of Brazilian air carrier TAM is seen at the tarmac in front of the skyline of Fortaleza, at the airport in Fortaleza June 18, 2014. In a project called " On The Sidelines " Reuters photographers share pictures showing their own quirky and creative view of the 2014 World Cup in Brazil. REUTERS/Kai Pfaffenbach (BRAZIL - Tags: SPORT SOCCER WORLD CUP SOCIETY CITYSCAPE TRANSPORT)

Air Force One is seen from the air at Bismarck Municipal Airport in North Dakota, June 13, 2014. REUTERS/Larry Downing (UNITED STATES - Tags: POLITICS TRANSPORT)

Smoke billows from Jinnah International Airport in Karachi June 9, 2014. Gunmen attacked one of Pakistan's biggest airports on Sunday and at least 23 people were killed, including all 10 of the attackers, media reported. REUTERS/Athar Hussain (PAKISTAN - Tags: TRANSPORT CIVIL UNREST TPX IMAGES OF THE DAY)

An aerial view shows the new Sao Goncalo do Amarante international airport, built in preparation for increased traffic during the 2014 soccer World Cup, in Natal January 22, 2014. When Brazil drafted plans to host the upcoming World Cup, this Atlantic beach destination was exactly the type of city it wanted to show off. Five years later, and four weeks before kickoff, little besides the arena and a remote, untested airport are complete. Picture taken on January 22, 2014. To match Insight BRAZIL-WORLDCUP/LEGACY REUTERS/Sergio Moraes (BRAZIL - Tags: TRAVEL SPORT SOCCER WORLD CUP BUSINESS TRANSPORT)

U.S. Secretary of State John Kerry leaves Stansted Airport to return to the United States from London on May 16, 2014. REUTERS/Jacquelyn Martin/Pool (BRITAIN - Tags: POLITICS)

Spaceport America's Virgin Galactic Gateway to Space Building is seen near Truth or Consequences, New Mexico May 1, 2014. The world's first purpose-built commercial space base and soon-to-be site of the first space flights with Sir Richard Branson's Virgin Galactic is near the town of Truth or Consequences in New Mexico. The inaugural flight into suborbital space should happen later this year and the first astronauts, who have made reservations and paid $250,000 for the flight, should follow a month later. While it's not clear what the economic impact will be, many agree that Spaceport America should inject new energy into the town. Picture taken May 1, 2014. REUTERS/Lucy Nicholson (UNITED STATES - Tags: BUSINESS SOCIETY SCIENCE TECHNOLOGY TPX IMAGES OF THE DAY)

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An aerial view of the International Airport of Recife, northeastern Brazil, April 6, 2014. Recife is one of the host cities for the 2014 World Cup in Brazil. REUTERS/Paulo Whitaker (BRAZIL - Tags: TRANSPORT CITYSCAPE SPORT SOCCER WORLD CUP TRAVEL)

Co-Pilot, Flying Officer Marc Smith, flies his Royal Australian Air Force (RAAF) AP-3C Orion aircraft towards the runway at RAAF Pearce Base in Bullsbrook near Perth March 24, 2014, after searching for the missing Malaysian Airlines Flight MH370. An Australian aircraft scouring the southern Indian Ocean for signs of a Malaysia Airlines jet missing for more than two weeks has spotted two new objects, Australian Prime Minister Tony Abbott said on Monday. Abbott told parliament an Australian naval vessel was near where the objects, one circular and greenish grey in colour and the second orange and rectangular, had been seen and hoped to be able to recover them soon. REUTERS/Richard Wainwright/Pool (AUSTRALIA - Tags: MILITARY TRANSPORT DISASTER)

A member of Japan's disaster relief team takes a picture as one of two Japanese Government P-3 aircraft arrives at RAAF base Pearce near Perth, March 23, 2014. New French satellite images show possible debris from the missing Malaysia Airlines flight MH370 deep in the southern Indian Ocean, Malaysia said on Sunday, adding to growing signs that the plane may have gone down in remote seas off Australia. REUTERS/Jason Reed (AUSTRALIA - Tags: MILITARY TRANSPORT)

A U.S. Airways plane with a collapsed nose is seen at Philadelphia International Airport March 13, 2014. The plane with 149 people on board that was about to take off from Philadelphia International Airport had its nose gear collapse on the runway on Thursday, but no one was injured in the incident, an airport spokeswoman said. REUTERS/Tom Mihalek (UNITED STATES - Tags: TRANSPORT DISASTER)

A U.S. Airways plane with a collapsed nose is seen at Philadelphia International Airport March 13, 2014. The plane with 149 people on board that was about to take off from Philadelphia International Airport had its nose gear collapse on the runway on Thursday, but no one was injured in the incident, an airport spokeswoman said. REUTERS/Tom Mihalek (UNITED STATES - Tags: TRANSPORT DISASTER TPX IMAGES OF THE DAY)