Thanks for the great info! We've done ADO, ETN, and UNO and I really wish we had a comparable system here in the US.

We took an overnight from Oaxaca to Tuxtla and before the start of the trip the female attendant introduced our 2 older, male drivers, each decked out in suits with shoulder bars. The drivers gave us a courteous greeting and then closed themselves off in the front "cockpit" area for the duration of the trip.

Totally in agreement with you about the status of the drivers: their position is comparable to that of an airline pilot here in the USA.