This is how I managed it, I was using Zen Flight on an 85 monk, tried to enter the Mogu instance in eastern Vale of the Eternal Blossoms and although I couldn't enter, it removed the Zen Flight debuff and my character remained flying at mount speed.
This is fairly similar to the flying trick for inside instances, but this allows you to fly around indoors in Pandaria.
May only work with a Monk below the level of the instance, might work with a level 90 entering a raid instance without a raid or any char on another continent.