American word for air mail

The American word for "air mail" is actually... (drumroll please)... "airmail"! Yes, in the United States, the term "airmail" is commonly used to refer to mail that is transported by airplane, as opposed to surface mail, which is transported by truck, train, or ship.

So, if you're sending a letter or package across the country or around the world, you might see the phrase "airmail" on the envelope or package, indicating that it's being sent by air.