Alright, but 48 hours in travel time for 120 hours of vacation is crazy. You should make sure you can be in Yangon so you don't miss your flight back to the US. I would not take a morning flight to Yangon on the same day you're supposed to fly back to the States, but I might be more conservative in my planning than you.

Again, I've never flown in Myanmar domestically, I've always traveled by bus.