The items of mail so carried.
The system of conveying mail using aircraft.
To send mail by air.
To (unintentionally) throw the ball well over a fielder's head where that fielder is unable to make a play on the ball.
A class of postage with delivery times slower than first class.
A class of travel, inferior to first class.
The second-lowest rank in the Boy Scouts of America, between tenderfoot and first class.