Has there been any UFO sightings in Alaska?

Yes; the captain and crew of Japan Air Lines Flight 1628 had a 51-minute sighting on November 17, 1968 over eastern Alaska.

On January 29, 1987, the crew of Alaska Airlines Flight 53 flying from Nome to Anchorage had a sighting about 60 miles west of McGrath.

On January 30, 1987, the pilot of a US Air Force KC-135 flying from Anchorage to Fairbanks reporting a sighting.