Right now, most airports in Bellisseria are a strip of asphalt, a small rez area, and that's about it. Belli Fairgrounds and Shell Yeah are a little bigger but they're still cumbersome to use if there's more than one aircraft there--even small ones.
I know LL has many reasons to not want to deal with airport nonsense, but Bay City has been around for a very long time, and if it was impractical to manage, presumably they would have closed it by now.
Bay City has a terminal and plenty of room to move a moderately sized aircraft, but still functions with a short auto-return time and a limited rez area. It's perfect for pilots who like airline roleplay and still requires very little oversight day-to-day. A larger airport in Belli would draw more pilots/sailors to the area, potentially for LL-run events, and make more Belli residents aware that SL aviation exists, giving some of them one more reason to stick around.
It seems your business plan is to jam-pack Belli with (revenue-generating) residential areas rather than make it a free-for-all like the original Mainland. But with a buffer of one or two sims (like Belli Fairgrounds, and Bay City for that matter), pilots could get in and out and residents would experience little to no increase in low-flying aircraft.
We appreciate what you've already done to make Bellisseria aviation-friendly (existing airports, the covenant, etc.), but if you want to make it appealing to a wider audience, you need at least one airport that can fit more than one or two single-engine prop planes at the same time.