I actually travel with my glider all the time and have had very positive experiences. She goes everywhere with me in a bonding pouch...restaurants, movies, doctors appointments, vacations, etc. For car trips, I keep her in her pouch that I wear and she sleeps while I'm driving. When I stop for bathroom breaks every few hours, she gets a bathroom break as well. I love being in hotel rooms with her because the bathrooms are usually fairly glider proof (toilet seat down of course) and we can have play/bonding time each night.
Airline travel is a little tricker but I can tell you what worked for me. When I adopted my little suggie earlier this year, I traveled by air to another state where the breeder was. I knew I'd be returning home by air with my new addition so I called various airlines and they told me the same thing you found out...no exotic pets in the cabin (frustrating, since they do accept dogs, cats, birds, bunnies, monkeys, and spiders...but that's another story). So I made a reservation for her to fly in cargo. Putting a pet in cargo is a personal decision. I'd like to think that airline employees will take special care of our beloved pets. And many breeders ship their gliders around the country/world via airlines without any problems. Having said that, I was uneasy about it. My newly adopted little girl had already been taken from her mom, home, and breeder and would be travelling with me, a stranger. I didn't want to traumatized her further. So I asked the breeder what she would suggest and she put me in touch with a psychologist who "interviewed" me over the phone and diagnosed me with an anxiety disorder. So basically my sugar glider is now registered as a service animal (emotional support pet, to be exact). I'm now able to travel in the cabin with her, Going through security at the airport was nervewracking at first, but after 3 times so far, it gets much easier. You just let TSA know you have a service pet and they will decide how to proceed (ie: full body pat down vs. body scanner vs. metal detector, etc.). They have always been extremely helpful and respectful.
Wishing both of you many happy and safe adventures together!