Basically, pick an airline, find a way to ask someone in whatever operational HQ that airline has. United's ramp towers usually have a liason who retired from that airport who both works with station ops during crazy events and the FAA tower/FAA metering, but otherwise are home usually. I've heard of a lot of random stuff, I'd have to imagine every even medium sized airline has some kind of gig for someone like you. With flight benefits. Just narrow it down to where you want to live I guess, as these are likely HQ area jobs.
Those gigs lead to consulting where you get random cake jobs. When SFO set up Passur metering equipment, there were retired ATC guys getting paid to sit in ramp towers and do literally nothing. Just take photos and naps while you "montior" how the metering system is being used by the ramp controllers who aren't even looking at it. They made so much money on that project and by the 3rd day they were just totally checked out and disappearing for 3 hour AirTrain rides to think about old man stuff. The American Dream.
EDIT: I remember we literally dismantled the monitors because they took up counter space and we didn't see the guys for weeks. Then about another month later, one of the guys comes to get his stuff and is shocked that the airport hasn't noticed the system was dismantled. He laughed hysterically and told us he is getting paid until the end of that week. After he left, I never personally saw any of them again and the equipment sat there boxed for about a year before the airport asked the janitor to grab the box.
Who wouldn't want that job? Lol.