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Interesting view. I expect you don't usually fly over cruise liners when just about to land.

Wow nice!

BOS TWR: Cleared to land RY 4R Caution traffic, 12 o'clock below, at sea level, left to right, Cruise ship

Hahaha!

Approach plates for 04R mention "tall vessels" and how their presence alters landing minima. Between the naval yard, cruise ships, and other large ships, I imagine there is a decent amount of water traffic.