Originally Posted by
Often1
But, as a general proposition, the first and most important thing to look for is that e-ticket receipt as it is what triggers all of your DOT protections. While there may be other ways to "prove" the ticket cost, the receipt is the easiest way to do this.
Odd the DOT regulation (14CFR399.88) never once mentions a ticket, just that the purchase has occurred when the full amount agreed upon has been paid. Can you link to a publication from the DOT stating that an e-ticket receipt triggers protections?