I think we can all agree on one thing:
Anyone who voices their opinion, and at the same time admits he is clueless about everything surrounding the situations, cannot be relied upon for psak whatsoever
Chaikel, that is not what happened here. You can pasken a shaila without knowing the price of a ticket.
If the mistake was the tickets for 3.50, what would you say then, Dan? Would you agree that it is a significant loss? Would you have a chiyuv hashavas aveida? Would it be asur lefarsem?
A different point - I think (without understand fuel tax like some people here) that El Al got burned with their own shtick. Fwiu, the fuel charge is a scam, a way to make the ticket price sound less.