The Teletype (TM) ASR28 was the heavy-duty "brother" of the ASR33. Certainly not airborne. I don't know the 26.
I vaguely remember that the type of the '28 was in a rectangular box which shifted in two axis to place the correct letter under the hammer. The '33 type was on a drum which rotated. the 15/19 type was in a basket like a conventional typewriter.