okay, you could carry on your gecko but keep it in you pocket so when they scan your bag they cant see it. bring a small extra bag so you can put your gecko in it once you get one the plane and so it feels safe. you can bring a portable heat pack too, $2 dollars from a reptile store here in cali. as long as there are no dogs you should be okay. i dont recomend the cargo because you probably need some stupid permit or something to go across the border. i have also heard horror stories about animals in cargo on people planes.
or you could have your gecko stay with a friend for a day or two until you get to your new home, then you can have your friend mail it to you in the 24hour express. you also would need a heat pack for this and need to prepackage the gecko so the post office/UPS/fedex wont know its live and make you get a permit. just make sure you mark the box acordingly, frgile ect.
or you could just drive. all that i would think you could get away with if you were carefull. also if you drive and when you cross the border dont let the border people see it either because they could get weird too. its all something i would do, however im young and dumb, hahaha. good luck!
