Are you looking at the airplane in the sky?
When you think abut it carefully, you know the preposition 'at' is the clue to usage.
see + object
look + at + object
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Holy
(adj): Sacred, divine, blessed.
Holiday: a holy or festive day; a day off, vacation (also sacred)
Expressions: Holy Cow! Literally true in India.
Ex: Holly Mackerel! Delicious, healthy and full of mercury.