Were you specific when asking the Airline that you wanted to bring your gliders into the passenger cabin? They may have been telling you that they could be transported in the climate controlled cargo area.
Which airline did you talk to?
Before you attempt to take your gliders with you, I would get that IN WRITING before you go to the airport. Be sure to check with ALL AIRPORTS you will travel through.
As far as I know NONE of the airlines allow sugar gliders to be carried on board in the passenger cabin. You could be forced to either miss your flight - or to have someone come to the airport to get your gliders if they are found on you when you are going through security or boarding the plane.
If you were successful in sneaking them on board on the first part of your trip - you might be stopped from boarding on your return trip - and not be able to get your gliders back home.
Some but not all airlines or all planes are equipped with climate controlled cargo areas used for shipping pets. There may be limitations on sugar glider traveling this way if it is either VERY hot or cold at any of the airports because they might be out in the weather for quite some time before being loaded onto the plane.
I do not think anyone will be able to tell you how your gliders would react to the pressure changes in the passenger cabin but gliders that are shipped in the climate controlled cargo area do just fine.