People wanting to go to GMA : don't worry, he won't cancel this one, it's already on his myspace. And like someone said : you DON'T cancel on GMA if you want to break through US. You should be safe on this one.
People wanting to go to Quebec, it would be physically possible to flight from NY to Quebec, or from NY to Montreal and then go to Quebec, it's "only" a 3 hours drive.
People wanting to go to WOW Sweden, i really don't know, but maybe he could perform on the 11th. In my opinion, this one is the less possible gig he could perform... And Jassissa, i'm not sure they would change your ticket just because Mika changed his day if he's not the only artist who was supposed to perform on August 10th at WOW, cause it's a festival, so you're not supposed to buy tickets to see only one artist... Or it's at your own risks... I'm sorry, but maybe i'm wrong !
About flying, i think he flies with normal planes, the Music company should pay for the tickets and so on.