[Maine-birds] Eagle with white "windows" in the wings - Yarmouth

Yesterday at 2 pm i was driving north Portland to Yarmouth on 295 and saw way up ahead two soaring dark birds.  I dismissed them as Turkey Vultures, commonly seen, but as i sped closer, there was no teetering to the soaring and they were larger that TV's, so I thought:  great!  a pair of Bald Eagles.  But as I passed directly underneath at 65 mph, I noticed there was no white head/tail, so I figured "immature Bald Eagle."  But as the eagle banked, there were very distinct white windows showing (about 1/3 of the way in from wingtips).  Given there was a pair, and given proximity to the ocean, and given what is expected here this time of year, I thought Baldies, but since last night it has been bugging me, as I keep seeing pictures in my field guides that shows Golden Eagle with those distinct white patches ("windows") on the wings.  Is it possible I had a Golden?  Or are immature Baldies showing distinct white wing patches in flight?

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