Prepositions are words that indicate relationships with the other words in the sentence. Prepositions of place are used to refer to a place, usually to denote the location of something or someone.
Let's look at the usage of various alternatives in the option as preposition of place:
at : to refer to an exact place where something is situated / event
on : to refer to placement of something attached / adjacent to something else; to refer to something displayed on something else
off : not used as a preposition of place
over : to refer to across specific sides; or something place one above / higher than the other; or to mean "more than"
In the sentence, as a reference to a specific location , i.e. Heathrow Airport. Therefore, the suitable preposition here is "at".
Thus, the correct complete sentence is:
We stopped for three-quarters of an hour AT Heathrow Airport.
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