A method of making a bulkhead fitting assembly may include joining a tube to a thermal shell of a mounting flange, the mounting flange shaped to be attached to a bulkhead and including an adapter; forming the thermal shell to have a portion spaced away from the tube to form an air pocket between the tube and the thermal shell adjacent the mounting flange; and placing a bushing on the adapter such that the bushing completes a current path from the tube to the adapter, from the adapter to the bushing, and from the bushing to the bulkhead.