I don't know about getting in trouble. I think it depends on the airport. I have heard mixed things from various airports. I haven't been told I can't. One day, I even drove out to the middle of the tarmac near the service road that runs parallel to a taxi-way and just sat there taking pics with a co-worker. A cop drove by multiple times and never came over to stop us.
Not that I'd wish trouble on a fellow SimVer, but it bothers me a bit that he didn't at least confirm you were a legitimate employee and leave you to it... also, I'd check the employee handbook for any mention of taking pictures, just to cover my keister, if I were you. Someday some hard-on might decide to nail you for that, if it's officially a no-no. That's a cool job you've got- be a shame to lose it over a (politically sensitive) technicality. Thanks for the pics, BTW...
Another BTW:I'm curious; what's your next move- flying? A&P? Management? Something completely different? Or are you content (can't say I'd fault you for that)?