"ONTHEWING" in crossword puzzles

"ONTHEWING" IS THE Answer TO THE FOLLOWING CROSSWORDS

1. (of birds) flying
2. Old collection of books — making use of 19 in flight?
3. Not out, cutting in the air
4. Where feathers are flying
5. Where one might see feathers flying
6. Flying up and down the touchline?
7. In transit, cutting south of ontario
8. Books wrapped in old cutting like a flier
9. About to go flying
10. Flying down the touchline
11. 'come swiftly -- -- --' (carol)
12. Flying from ontario, using a chopper