code: public static <T extends ModeSReply> boolean isAirbornePosition(T reply) {
  		if (reply == null) return false;
  		ModeSReply.subtype t = reply.getType();
  		return (t == ModeSReply.subtype.ADSB_AIRBORN_POSITION_V0 ||
  				t == ModeSReply.subtype.ADSB_AIRBORN_POSITION_V1 ||
  				t == ModeSReply.subtype.ADSB_AIRBORN_POSITION_V2);
  	}
docs: Check whether a ModeSReply is an airborne position (of any version), i.e., it
  is of type {@link AirbornePositionV0Msg}, {@link AirbornePositionV1Msg} or {@link AirbornePositionV2Msg}
  @param reply the ModeSReply to check
  @param <T> {@link ModeSReply} or one of its sub classes