It's not gonna work with beta4, gotta be on dev. Is there a reason the other apps can't run on 7.3? There isn't too much of a difference. 7.2 was also deprecated a long time ago and 7.3 is also on its way out.
What database versions are you using? All of those columns/queries are being joined so multiple queries don't need to be made when it can all be returned in one
There isn't. I went this way because subfleet assignments are how they're done in real-life OPS. Though I guess in the end they do assign specific aircraft to a specific flight on a specific day, which doesn't happen here. I'm not sure how to change that without changing how the entire thing works.
Are you using HTTPS? Did anything change there? Connection timed out means there's an issue between the ACARS and site. Are you the only one having the issue?
Is that also an additional fuel used you want to do? It's probably better to do that in a module listening to one of the PIREP events. That way it won't get overwritten.
Edit: Sorry, just realized we already talked and you opened that Github issue. I'll be adding that in.