Easyjet CEO Carolyn McCall (R) and founder Stelios Haji-Ioannou attend a media event to celebrate 20 years in business at Luton Airport, southern England, November 10, 2015. British low cost carrier easyJet said it would launch a loyalty scheme for its most frequent travelers, the latest perk to be added that is more usually associated with traditional airlines. At an event marking 20 years since its first flight on Tuesday, easyJet said it would reward customers who fly with it more than 20 times a year by offering them benefits such as flight changes for free. REUTERS/Eddie Keogh