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Delta Air Lines & Delta Connection US & Canada routes
1. US domestic & Canada
2. Hawaii & Alaska

Delta Air Lines & Delta Connection US Lower 48 domestic routes
3. from Atlanta
4. from Detroit
5. from Minneapolis-St.Paul
6. from Salt Lake City
7. from Cincinnati/N.Kentucky
8. from New York
9. from Los Angeles
10.from Memphis

Delta Connection domestic & international routes
11. ASA Atlantic Southeast Airlines
12. Chautauqua Airlines
13. Comair
14. Freedom Airlines
15. Mesaba Airlines
16. Pinnacle Airlines
17. SkyWest
18. Shuttle America
19. Compass Airlines

Delta Air Lines & Delta Connection international routes
20. Latin America & the Caribbean
21. Europe
22. Asia-Pacific & Australia
23. Africa, Middle East & India

former Song by Delta (ceased 2006)
24. Domestic network
25. International network

former Northwest Airlines routes (pre-2008 merger)
26. from Minneapolis/St.Paul
27. from Detroit
28. from Memphis
29. from Indianapolis
30. Canada & Alaska
31. Mexico, Central America & the Caribbean
32. Far East & Hawaii
33. Europe, India & KLM codeshare routes

Delta Airlines major codeshare partners in North America
34. Alaska Airlines via Seattle to Alaska
35. AeroMéxico for trans-border & Mexico domestic services

Delta Air Lines major codeshare partners worldwide
36. Air France/KLM via Paris/Amsterdam to Europe, Middle East & Africa
37. Alitalia to Europe via Milan/Rome & Italy domestic
38. Korean Air transpacific & via Seoul to Japan, China & SE Asia
39. Avianca via Bogota to Colombia domestic
40. CSA Czech Airlines via Prague to Eastern Europe