If they are CA hinges...just cut them with a razor blade.  Then buy new CA hinges and cut, or "slice" your hinge grooves (they make a tool for this so you get them exactly parallel) into both the aileron and wing/stab.

Once you are ready to reinstall the hinge I always take some push-pins and insert right into the center of the new hinge (this will assure you that you get eqaul parts of the hinge on both pieces. 

One you have center pinned your new hinges, reassemble your aileron/wing with the hinge and put a few drops of CA on each side.

DO NOT PUT THE HINGE IN THE AILERON AND GLUE IT....THEN TRY TO PUT THE AILERON W/HINGE ALREADY GLUED INTO THE WING AND GLUE IT.  THE CA HINGE WICKS THE CA TO ALL AREAS.  YOU WILL NOT GET A GOOD BOND AND POSSIBLY WONT EVEN GET THE HINGE INTO THE OTHER PART OF THE WING.

So...always assemble it...THEN glue it.

IF they are anything other than CA hinges...Im not sure about the "best practice" to remove them.  If they were glued in with epoxy...I will say that you will remove them with a heat gun.  Heating up epoxy degrades its bonding and you should be able to pull them out with pliers once hot enough.  This will ruin your covering...but you are recovering anyway...so thats ok.  Just dont get any other wood joints too hot with the heat gun.  Concentrate your heat on the hinge area only.