Stuck in Anchorage

A flight cancellation has me stuck in anchorage for the night.
Anyway, an odd thing happens when you fly north from Seattle this time a year at midnight: a couple hours into the flight you notice a blue and red glowing blob on the black horizon, North-west. You think, could it be northern lights? But then it grows and entually envelopes you: its the sun, rising in the north, at midnight.