But this one states the capacity will be increased to 5 departures/hour after completion of the expansionhttp://www.myanmars.net/myanmar-travel/yangon-international-airport.htm
I quick check on flightstats.com though gives a different story. I only checked domestic departures for tomorrow, december 2nd. a total of 12 departures are listed between 6-7AM. A crosscheck with the airlinewebsites kind of backs this up. Air Bagan has 5 departures, confirmed with their website. Air Mandalay got 1 departure, Yangon Airways got 1 departure. This adds up to 7 departures. Then flightstats mentions Myanma Airways departures, total of 4 departures between 6AM-7AM. This can not be confirmed as I haven't been able to find a reliable website for Myanma Airways. Not surprised as it is a government run airline. (Funny enough it was impossible to find anyone who would sell me a ticket on Myanma Airways flights. whether they found it unsafe or they just don't accept foreigners I don't know, but I couldn't buy a ticket for Myanma Airways flights, in 2005)
Anyway, flightstats gives me 7 confirmed departures in 1 hour, and 11 unconfirmed departures in 1 hour.