aeromechanic

The story

1. Proto-Indo-European*h₂ews-
2. Proto-Indo-European*h₂ewsér
3. Proto-Hellenic*auhḗr
4. Ancient Greekᾱ̓ήρ (āḗr)
5. Ancient Greekἀέρος (aéros)
6. Englishaero-
7. Proto-Indo-European*megʰ-der.?
8. Ancient Greekμηχανή (mēkhanḗ)
9. Ancient Greekμηχανικός (mēkhanikós)
10. Latinmēchanicus
11. Old Frenchmecanique
12. Middle Englishmekanyk
13. Englishmechanic
14. English todayaeromechanic

From aero- + mechanic.