.

United Express USA + Canada routes
6.  Mesa Airlines (from Chicago, Denver & Washington)
7.  SkyWest (from Chicago, Denver, San Francisco & Los Angeles)
8.  Chautauqua Airlines (from Chicago & Washington)
9.  Trans States Airlines (from Chicago & Washington)
10. Shuttle America (from Chicago & Washington)
11. Colgan Air (from Washington)
12. GoJet Airlines (from Chicago, Denver & Washington)
13.  Air Wisconsin (ceased as United Express 2006)

United Airlines international + Alaska routes
14. Asia & Australia
15. Alaska, Canada, Latin America & Europe

Ted by United
16. Domestic & international routes

United Airlines major codeshare partners within North America
17. US Airways via Philadelphia, Charlotte & Pittsburgh
18. Great Lakes Airlines to the Rockies region via Denver
19. Aloha Airlines to Hawaiian Islands
20. Gulfstream to The Bahamas via Ft. Lauderdale & Miami
21. Air Canada for trans-border (including AC Jazz) & Canada domestic services

United Airlines major codeshare partners worldwide
22. Lufthansa via Frankfurt to Western & Eastern Europe, Africa & Middle East
23. SAS via Copenhagen/Stockholm to Scandinavia & Europe
24. BMI via London to UK domestic network
25. VARIG via Sao Paulo to Brazil domestic network
26. ANA via Tokyo/Osaka to Japan domestic network
27. Air New Zealand - transpacific & via Auckland to Australia & New Zealand
28. Virgin Blue via Sydney/Melbourne to Australia domestic network