Although the transportation service known as Airmail is gone (it's been replaced with services like International Priority Airmail™), the United States Postal Service trademarked the name Air Mail in In June 2006. This classic Airmail style of stationary is now sold for decorative use rather than practical use.
Do you still write Air mail on international letters?
First-Class Mail International
Although you can still purchase airmail envelopes, it is not necessary to use them. Letters sent overseas are now classified as First-Class Mail International and always travel by air.
Is there still such a thing as airmail?
Remnants of domestic airmail survive today as space-available and parcel airlift services for the military. ... Despite the lingering presence of occasional SAM and PAL parcels, domestic airmail is now part of history, but has left hobbyists a rich trove of material to collect, study and enjoy.