spot on GT.
In a recent article in Forbes the average ticket (incl 1st class) LAX - LGA was $506 and the costs:
Fuel: 98
Labour:95
A/c ownership: 25
Non-A/c ownership: 17
Non-emploee labour: 32
Partners & merchants: 54
Interest: 12
other airline exp: 27
Taxes: 75
Misc: 37
Profit: 34