The idea of an A plan is great, but the risk of an airline shedding the expense in bankruptcy is very real - are you willing to take that risk?
A 401K is portable which makes it attractive, also if you can self manage the assets you could potentially outperform A plan returns (insert pilot investor jokes here).
With 11% company contribution into a 401K, you could match pretax 15% and be pretty close to the IRS 415 limits.
I'm sure we'll see Excell spreadsheets popping up soon to help with the analysis.