Airborne Service Devised by Walter Windham in 1911

This page is the CodyCross answer for the clue below from Past and Present Tech, Group 1460, Puzzle 1 (Mechanical Calculator).

Question is: Airborne Service Devised by Walter Windham in 1911

and the answer is: AIRMAIL

Word Meaning:

AIRMAIL — The system of conveying mail using aircraft.

Definitions from Wiktionary.

Airborne Service Devised By Walter Windham In 1911 - Past and Present Tech CodyCross Answers | CodyCross Solutions