There are 4 domestic airlines in Myanmar. Myanmar Airways (Union of Burma Airways) for owner of states formerly. At present Myanmar Airways is private company. Air Bagan, Air Mandalay & Yangon Airways are also private and new.
In local trip, Air Bagan, Air Mandalay or Yangon Air is more suitable for foreigner. Myanmar Airways fee is cheap but plane is rather old and schedule be canceled often. We recommend to use Myanmar Airways , the place you want to go , run only Myanmar Airways.