Here's an interesting video of someone who got to see them arrive at an airport for a concert. Evidently there were at least 2 planes. You'll see Timothy exiting the plane and walking to the right, to an SUV marked 1, and either Don or Glenn. Somewhere it's mentioned Joe was on another plane. Stuart can be seen pretty early on getting into the first group of SUVs.
https://m.youtube.com/watch?v=dKFKeCyxWgI
In the 70's I worked in a hotel where a lot of celebrities/groups stayed and back then the key players stayed in the same hotel but the road crew were on buses sometimes with 2 crews traveling and setting up in different cities. Never saw any of the Eagles, darn it. Sometimes it was fun, sometimes eye-opening, and sometimes it was absolutely awful. I'll never forget how incredibly kind and polite The Average White Band guys were. And at the same time, my best friend was a flight attendant so she'd see a lot of tv/movie people before private planes became the norm.