Ted Stevens Anchorage International Airport: This is the practical main gateway for a road-trip Alaska itinerary. To downtown Anchorage, use People Mover Route 65 from the South Terminal when its schedule suits: roughly 30 minutes and about US$2. For most visitors, however, the actually useful move is an airport rental car—Anchorage is only the staging point for the Kenai, Denali and beyond, and the state has almost no useful intercity public transport. A taxi/rideshare is sensible only if you are staying downtown; do not pre-book an expensive generic “airport transfer.”
Fairbanks International Airport: A straightforward rental-car airport for Interior Alaska, southwest of downtown Fairbanks. Use a taxi or hotel shuttle only if you are staying in town; rent a car for Chena Hot Springs, the highway network and aurora chasing. Do not assume Anchorage-style urban transit or rideshare availability.
Juneau International Airport: The Southeast gateway for Juneau, but it does not connect you to the Alaska road system: Juneau itself has no road link to Anchorage. Use local taxi/rideshare or bus for town, then plan onward travel by Alaska Marine Highway ferry or regional flight. It is a good arrival only if Southeast Alaska—not a statewide road trip—is the point.
Ketchikan International Airport: Ketchikan’s airport is on Gravina Island, opposite the town; the airport ferry is the normal connection, followed by local ground transport. Treat Ketchikan as an Inside Passage stop reached by air or ferry, not as a starting point for driving Alaska.