The X-port is only available on HobbyZone and ParkZone planes

www.hobbyzonesports.com

www.parkzone.com

Not all of their planes have the X-port so you have to read the specs.

The Hobbyzone Aerobird Challenger and Xtreme have it for sure

The ParkZone Stryker and Stryker B have the X-port but I am pretty sure the C does not.

The new Super Cub has it as well.

You will find a lot more on these planes and other electic planes in the Electric Universe which is a few forums down. This forum is more for fuel planes.