United Airlines Chief Executive Officer Oscar Munoz poses for pictures in his office at the company’s headquarters in Chicago, Illinois, U.S., November 14, 2018. Picture taken November 14, 2018. REUTERS/Tracy Rucinski 

United Airlines Chief Executive Officer Oscar Munoz poses for pictures in his office at the company’s headquarters in Chicago, Illinois, U.S., November 14, 2018. Picture taken November 14, 2018. REUTERS/Tracy Rucinski 

United Airlines Chief Executive Officer Oscar Munoz poses for pictures in his office at the company’s headquarters in Chicago, Illinois, U.S., November 14, 2018. Picture taken November 14, 2018. REUTERS/Tracy Rucinski 

United Airlines Chief Executive Officer Oscar Munoz poses for pictures in his office at the company’s headquarters in Chicago, Illinois, U.S., November 14, 2018. Picture taken November 14, 2018. REUTERS/Tracy Rucinski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Oscar Munoz, CEO of United Airlines, discusses his vision for the company, in Chicago, Illinois, U.S., March 21, 2018. REUTERS/Kamil Krzaczynski 

Malaysia Airlines CEO Peter Bellew (C) talks next to United Airlines Chief Executive Officer Oscar Munoz (L) and CEO of Mexican low-cost air carrier Volaris Inc. Enrique Beltranena during a meeting of the International Air Transport Association (IATA) in Cancun, Mexico June 5, 2017. REUTERS/Victor Ruiz Garcia 

Oscar Munoz, chief executive of United Airlines, attends a meeting of the International Air Transport Association (IATA) in Cancun, Mexico June 5, 2017. REUTERS/Victor Ruiz Garcia 

Oscar Munoz, chief executive of United Airlines, attends a meeting of the International Air Transport Association (IATA) in Cancun, Mexico June 5, 2017. REUTERS/Victor Ruiz Garcia 

Oscar Munoz, chief executive of United Airlines, attends a meeting of the International Air Transport Association (IATA) in Cancun, Mexico June 5, 2017. REUTERS/Victor Ruiz Garcia 

Oscar Munoz (L), chief executive of United Airlines, talks next to Malaysia Airlines CEO Peter Bellew, during a meeting of the International Air Transport Association (IATA) in Cancun, Mexico June 5, 2017. REUTERS/Victor Ruiz Garcia 

Mario Schlosser, CEO and co-founder of Oscar speaks to guests during the TechCrunch Disrupt event in Manhattan, in New York City, NY, U.S. May 15, 2017. REUTERS/Eduardo Munoz 

Mario Schlosser, CEO and co-founder of Oscar speaks to guests during the TechCrunch Disrupt event in Manhattan, in New York City, NY, U.S. May 15, 2017. REUTERS/Eduardo Munoz 

Mario Schlosser (L), CEO and co-founder of Oscar speaks to guests during the TechCrunch Disrupt event in Manhattan, in New York City, NY, U.S. May 15, 2017. REUTERS/Eduardo Munoz 

Mario Schlosser, CEO and co-founder of Oscar speaks to guests during the TechCrunch Disrupt event in Manhattan, in New York City, NY, U.S. May 15, 2017. REUTERS/Eduardo Munoz 

Mario Schlosser (L), CEO and co-founder of Oscar speaks to guests during the TechCrunch Disrupt event in Manhattan, in New York City, NY, U.S. May 15, 2017. REUTERS/Eduardo Munoz 

Oscar Munoz (L), CEO of United Airlines and Scott Kirby (C), president of United Airlines, testify at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the recent forced removal of a passenger from a Chicago flight at the U.S. Capitol in Washington, D.C., U.S., May 2, 2017. REUTERS/Kevin Lamarque 

Oscar Munoz (L), CEO of United Airlines and Scott Kirby (C), president of United Airlines, testify at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the recent forced removal of a passenger from a Chicago flight at the U.S. Capitol in Washington, D.C., U.S., May 2, 2017. REUTERS/Kevin Lamarque 

Oscar Munoz, CEO of United Airlines, testifies at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the recent forced removal of a passenger from a Chicago flight at the U.S. Capitol in Washington, D.C., U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz is seated prior to testifying at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

Oscar Munoz, CEO of United Airlines, listens to remarks as he testifies at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the recent forced removal of a passenger from a Chicago flight at the U.S. Capitol in Washington, D.C., U.S., May 2, 2017. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY 

United Airlines CEO Oscar Munoz is seated prior to testifying at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

Oscar Munoz, CEO of United Airlines, listens to remarks as he testifies at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the recent forced removal of a passenger from a Chicago flight at the U.S. Capitol in Washington, D.C., U.S., May 2, 2017. REUTERS/Kevin Lamarque 

Oscar Munoz, CEO of United Airlines listens to remarks as he testifies at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the recent forced removal of a passenger from a Chicago flight at the U.S. Capitol, in Washington, D.C., U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz is seated prior to testifying at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz pauses while testifying at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz pauses while testifying at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz (L) testifies next to UAL President Scott Kirby at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz testifies at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz (L) testifies next to UAL President Scott Kirby at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz (L) and UAL President Scott Kirby prepare to testify at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz prepares to testify at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz (L) is greeted prior to testifying at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz prepares to testify at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz (L) and UAL President Scott Kirby prepare to testify at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz prepares to testify at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

United Airlines CEO Oscar Munoz prepares to testify at a House Transportation and Infrastructure Committee hearing on "Oversight of U.S. Airline Customer Service," in the aftermath of the forced removal on April 9 of a passenger from a UAL Chicago flight, on Capitol Hill in Washington, U.S., May 2, 2017. REUTERS/Kevin Lamarque 

U.S. President Donald Trump takes his seat along with United Airlines CEO Oscar Munoz (L) and Delta Airlines CEO Edward Bastian (R) for a meeting with airline industry CEOs at the White House in Washington, U.S., February 9, 2017. REUTERS/Kevin Lamarque 

U.S. President Donald Trump talks with Chief Executive Officer of Los Angeles World Airports Deborah Flint (C) and United Airlines CEO Oscar Munoz during a meeting with airline industry CEOs at the White House in Washington, U.S., February 9, 2017. REUTERS/Kevin Lamarque 

U.S. President Donald Trump talks with Chief Executive Officer of Los Angeles World Airports Deborah Flint (2nd L), United Airlines CEO Oscar Munoz (L) and Myron Gray (R), president of U.S. Operations for UPS, during a meeting with airline industry CEOs at the White House in Washington, U.S., February 9, 2017. REUTERS/Kevin Lamarque 

U.S. President Donald Trump takes his seat along with United Airlines CEO Oscar Munoz (L) and Delta Airlines CEO Edward Bastian (R) for a meeting with airline industry CEO's at the White House in Washington, U.S. February 9, 2017. REUTERS/Kevin Lamarque 

U.S. President Donald Trump takes his seat along with United Airlines CEO Oscar Munoz (L) and Delta Airlines CEO Edward Bastian (R) for a meeting with airline industry CEO's at the White House in Washington, U.S. February 9, 2017. REUTERS/Kevin Lamarque 

Chief Executive Officer of United Airlines Oscar Munoz introduces a new international business class dubbed United Polaris in New York, U.S. June 2, 2016. REUTERS/Lucas Jackson 

Chief Executive Officer of United Airlines Oscar Munoz introduces a new international business class dubbed United Polaris in New York, U.S. June 2, 2016. REUTERS/Lucas Jackson 

Chief Executive Officer of United Airlines Oscar Munoz introduces a new international business class dubbed United Polaris in New York, U.S. June 2, 2016. REUTERS/Lucas Jackson 

Chief Executive Officer of United Airlines Oscar Munoz introduces a new international business class dubbed United Polaris in New York, U.S. June 2, 2016. REUTERS/Lucas Jackson 

Chief Executive Officer of United Airlines Oscar Munoz introduces a new international business class dubbed United Polaris in New York, U.S. June 2, 2016. REUTERS/Lucas Jackson