As the charge is technically not leved by airlines or really has much legally to do with them it would not have to feature in the T&C. It would be viewed as a contract, of sorts, between you and the airport.

I think it would be reasonable to contend that, as the airline has been contracted to transport a passenger from one airport to another, they have at the very least a duty of care to advise passengers of additional charges associated with that transportation – the airline is transporting passengers from [say] Liverpool to Geneva, not from airside at Liverpool to Geneva. Also, having paid a “security fee” as part of the total cost of said transportation and seeing as the airline is not directly involved in security, I think it would be reasonable to contend that the security fee represented the total paid fo said security, not just a part of it. I accept that a precident may have been set in some countries where there is a locally paid departure tax that is not included with ticket purchase, but I still think that if Liverpool go ahead and implement this charge someone needs to challenge the legality of it both in principal an in the context of the airline’s terms and conditions of carriage and booking conditions that we’re all invited to read as we book flights these days.

Andy