If you don't want to go the route of 4 credit cards, you could sign up for one and then convert to a r/t first class upgrade. Plus you get those great coupons with the Visa Platinum card. (one way FC upgrade, 50% companion cert and 2 Alaska boardroom passes)

Or if you happen to be in Alaska you could take a flight on Bearing Air or Era Aviation.

Era flys to Valdez, Kenai, Homer, Kodiak, Whitehorse and Cordova from ANC.