Updates for recent AAR improvements
* Radar is needed to check if you are close enough from the tanker
Refuel defines what type of refueling you are capable of , and if your refuel system is ok to receive (use the serviceable property if you have a switch to open the refuel trap for example).
* aar.nas is the actual system that checks the two above mentioned criteria and if both are true, refuels your tanks.
For the moment, flyable tankers are: KC135, victor and KC130 (in <tt>Aircraft/c130</tt>) if you need an example.
=== Serviceable option ===