Yes, most of the app's features work offline: 

  1. Flight Status notifications via text messages (this is a paid option). You can also subscribe  your family & friends. 
  2. Airport tips (Flight Feed -> Airport -> Explore) 
  3. Profile map with all your flight history, statistics, and achievements.
  4. Checklist 
  5. Hotel & Car Rental info
  6. Access to Travel docs & Boarding pass widget 
  7. Airline reviews
  8. Baggage info