HAL
The US government should be paying the added security costs. They require it - they pay for it.
And who exactly do you think the US government is?
Surely it's the people, where else does the money come from (oh ... sorry, of course the US has been running a multi-trillion dollar budget deficit for years). My point is that security has to be paid for, now should that be by the general public or the travelling public? ie a poor family struggling to get by or by companies and the better off individuals!
The ticket prices must reflect the cost. If not enough people are then not prepared to fly at the ticket price then reduce capacity. Pretty basic supply/demand economics really. But don't export your problems using Chapter 11 across the Atlantic to Europe, by artificially cross subsidising ticket prices - deal with YOUR problem locally.