PayPal Holdings, Inc. is an American company operating a worldwide online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.American Airlines (for flights in the US, Canada and UK only and using a US Paypal account only), Air Tran, Delta (for flights in the US only), Jet Blue (excluding flights to the Dominican Republic), Southwest, United (for flights in the US only),US Airways are the airlines that accept paypal as payment.