Delta has a monopoly on 22 nonstop markets at Minneapolis-St. Paul International Airport. Below, the top 10 of its single-carrier destinations and the average cost of a round-trip ticket.

1. Tampa, Fla. $292

2. Detroit $462

3. Baltimore-Washington $360

4. Portland, Ore. $404

5. Salt Lake City, Utah $396

6. Fort Lauderdale, Fla. $330

7. Kansas City, Mo. $422

8. Indianapolis $390

9. Orange County, Calif. $444

10. Raleigh-Durham, N.C. $354

Source: Metropolitan Airports Commission