Asian Wings Airways and other Myanmar airlines

[ILikeSloths]

Does anyone have experience with booking domestic airfare in Myanmar, specifically Asian Wings and doing it online?

We're going in Jan./Feb. and need to book domestic flights from Nyaung U to Heho and from Heho to Yangon.  I've read on other travel forums that tourists previously had to book flights through a local travel agent.  However, things are quickly changing with tourism there and it looks like Asian Wings now has an online option, but I can't seem to find others' experiences with it yet.  I just want to be sure it's legit and dependable before I book.  

I also attempted to contact 2 different highly recommended travel agents a month ago and received no response.  Since it's getting close to our trip I'd prefer to get it done online, or if anyone has experience with traveling in high season and booking flights through the hotels or agents once arriving in Thailand (we're going here first for 2 weeks) or Myanmar then we may do that.  I'm just afraid flights may become completely booked if we wait.