There's more than one "AMT" this year.

Watch out especially if your spouse works. The "additional medicare tax" under Obamacare could bite hard because Delta only withheld the tax based on one income.
If you look at your 12/31/14 pay stub it appears as "Med Surtax" on amounts over $200k.

Tax Topics - Topic 560 Additional Medicare Tax

Questions and Answers for the Additional Medicare Tax