Originally Posted by mobilebucky

2,3,4 are correct but Zone 1 are for 2P and 3P only. The actual UA boarding process is
1. GS/First/Buisness/1K (sometimes on Intl flight they might split into 2 groups)
2. Prem. Exec (1P and *G)
3. Zone 1 (2P/3P/*S)
4. Zone 2 (Windows)
5. Zone 3 (Middle)
6. Zone 4 (Aisle)