Quest 3, Varjo Aero, Reverb G2 are the units I have right now. I had a Quest Pro but sold it recently (decent unit as well).
Reverb G2 was the got to VR for a long time until the Aero came out. I'm speaking in terms of flying another game (DCS) here. Then the Aero came out and despite the huge cost tons of us went to it. The price has come down to $1000 USD for the Aero, and it's hands down the best currently available unit for "reasonable" amounts of $.
The Reverb 2 is capable still as well and less than 1/2 the cost. It is discontinued now or shortly though as the company that made it (HP) is getting out of VR production. Unfortunate.
Quest 3. It's 1/2 the Aero's cost at 500 ish dollars. Meta's Quest Link Cable or a suitable alternative to connect to your PC for a PCVR-ish experience is an extra cost. Virtual Desktop can be used in AH I'm sure for wireless Wifi connections. Battery lasts 2 to 4 hours though, so you still may want to go with the cable link with a cable that provides constant charging to the battery (I can provide an Amazon link to the one I use for the Q3).
Pimax Crystal is apparently amazing too, but costs even more than the Aero right now.
IMO for AH alone the Aero would be serious overkill. AH isn't nearly as taxing as DCS, and doesn't really have the same visuals and hence requirements either. AH looks great in VR though, I remember when I got my reviewer unit of the very first Occulus Rift, and when Dale/HT got his unit, he PM'd me and said "just fly the B17 and look at some of the exterior views". Blown away. And that was the Rift "1". Now, any of the decent VR units will work well with AH IMO.
IMO if you can't find a good Reverb G2, the Q3 is really the only decent option today in the sub 500$ bracket. The Pico 4 is an option too but I haven't tried it. Quest 3 is a fantastic little unit, I like it even more than the Quest Pro, and it looks better than the G2 with tweaking even in Virtual Desktop mode.
Or you can wait and see what 2024 brings. Most of the upcoming units are high priced though, as in $1000 minimum.
An decent Youtube channel to watch and search through for videos regarding flight sim VR questions here - guy has an annoying voice, but usually solid intel and opinions.
https://www.youtube.com/@VRFlightSimGuy/videos https://www.youtube.com/@mixedrealityTV