A method and apparatus for managing aircraft. An intermediate layer is disposed on an AlN ceramic substrate proximate the resistive heating element. The plurality of movable deflector arms can be two reciprocal assemblies of three deflector arms, each assembly movable on four pivot mounts. Transmitted data packets include a count value indicative of the sequence position of each data packet in a transmitted sequence of data packets. Also, a method of mounting a distribution box to a duct, at a distribution point that is spaced-apart from duct ends, may include positioning a distribution point duct section in the distribution box, and hermetically sealing a distribution chamber, defined within the distribution box, from an environment of the distribution box.