Wordnet 3.0
NOUN (1)
1. 
 travel via aircraft; 
- Example: "air travel involves too much waiting in airports"- Example: "if you've time to spare go by air"[syn: air travel, aviation, air]
WordNet (r) 3.0 (2006):
air travel
    n 1: travel via aircraft; "air travel involves too much waiting
         in airports"; "if you've time to spare go by air" [syn:
         air travel, aviation, air]