Facilities used by more than one air carrier, or for activities in addition to the storage of mail and freight (such as aircraft maintenance), must provide a distinct area for each air carrier’s mail storage. This area is to be defined by a fully enclosed locking security fence that is at least 8 feet high plus a top guard.
Hub point facilities for air carriers using mainline type aircraft and not providing intraline service to bush points must provide a minimum mail storage area of 300 square feet. Hub point facilities for destinating air carriers using bush type aircraft and not providing intraline service to bush points must provide a minimum mail storage area of 100 feet.
Facilities at origins Anchorage and Fairbanks must provide a minimum mail storage area of 300 square feet if mainline aircraft are used and 100 square feet if bush aircraft are used, except for air carriers receiving bypass mail (see section b, “Facility Review Checklist”).