Пре­об­ра­зуй­те, если это не­об­хо­ди­мо, слово FLY так, чтобы оно грам­ма­ти­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

One airline had a policy that required the first officer to stand at the door while the passengers exited. He smiled and thanked them for __________________ the airline.