Wordnet 3.0
VERB (2)
1. 
 be elated; 
- Example: "He was flying high during the summer months"2. 
 make steady progress; 
 be at the high point in one's career or reach a high point in historical significance or importance; 
- Example: "The new student is thriving"[syn: thrive, prosper, fly high, flourish]
WordNet (r) 3.0 (2006):
fly high
    v 1: be elated; "He was flying high during the summer months"
    2: make steady progress; be at the high point in one's career or
       reach a high point in historical significance or importance;
       "The new student is thriving" [syn: thrive, prosper, fly
       high, flourish]