It should be noted that as of September of 2003, Airborne Express was acquired by DHL, bringing the number of major, non-federal agency, shipping companies down to three. Empirical evidence shows that the brand name and trademark silver trucks are still being used, as is the name for some mail-order catalogs. Since DHL is currently running an ad campaign that seems to be trying to get their name out and get people to use a service other than FedEx or UPS, my guess is that they're keeping the name around for recognition.