And everything else question please: when transiting through Don Mueang on 2 domestic flights without checked baggage do you need to exit and then check in again with the general public, or is there any transit desk airside where you can check in for the second flight ?
TLDR : Answer Summary
When transiting through Don Mueang Airport on two domestic flights without checked baggage, you generally do not need to exit and check in again. You can check in online prior to your flight, which simplifies the process. Additionally, there is a transit desk available for each airline airside where check-ins can be completed, although this is typically for flights with the same airline. If your flights are on different airlines, you may have to consider whether checked baggage is involved, as this could change the situation.