I booked my flights to Amsterdam through Flight Ease and upgraded to Premium Economy (directly with Delta) on the return flight when Delta changed the aircraft. The price was a little lower than the airlines; however, Delta changed all my flights (after I was ticketed) which left us with a 4 hr layover at JFK. I was advised by Delta that I could change my flights, and there shouldn't be any extra charges to do so, because it was Delta who rescheduled the flight, but had to do so through Flight Ease. After two hours on the phone, the Flight Ease representative advised me that to changing my flights after full payment had been made would involve the cancellation of all tickets and a rebooking fee - thousands of dollars. Needless to say, I am sticking with the 4hr layover at JFK! In future, I will always book direct with the airline. I am not too familiar with the other airlines, but Delta bookings are very easy to change.
