New version Airtronics servos will work with Futaba and other brand systems with no modification. Old Airtronics servos have the wires in a different order on the plugs, and plugging them into a Futaba (or JR, Hitech... about anyone else's) RX will cause damage to the servos and the RX when you turn it on. (same for plugging other brand servos into old Airtronics RX if the servo is not modified for that)

There's 2 versions of transmitted FM signals... "+ shift" and "- shift" JR uses one, Hitech, Futaba and a few others use the other. (not sure which Airtronics uses...) A + shift TX's signal will essentially be ignored by a - shift RX and a - shift TX signal is essentially ignored by a + shift RX. (but they CAN interfere with each other, can't fly a + shift ch 54 and a - shift ch 54 {for example} at the same time... both are going to crash if you try it.)

There's several other discussions on these subjects...