chairoplane

The story

1. Proto-Indo-European*ḱe?
2. Proto-Indo-European*ḱóm
3. Proto-Indo-European*ḱm̥-th₂der.?
4. Proto-Hellenic*kətá
5. Ancient Greekκατά (katá)
6. Proto-Indo-European*sed-
7. Proto-Indo-European*sedreh₂
8. Proto-Hellenic*hédrā
9. Ancient Greekἕδρα (hédra)
10. Ancient Greekκᾰθέδρᾱ (kăthédrā)
11. Latincathedra
12. Old Frenchchaiere
13. Middle Englishchayere
14. Englishchair
15. Proto-Indo-European*h₂ews-
16. Proto-Indo-European*h₂ewsér
17. Proto-Hellenic*auhḗr
18. Ancient Greekᾱ̓ήρ (āḗr)
19. Ancient Greekπλανάω (planáō)
20. Ancient Greekᾱ̓ερόπλᾰνος (āeróplănos)
21. Frenchaéroplane
22. Englishaeroplane
23. English todaychairoplane

Blend of chair + aeroplane.