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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Military officials with the 142nd Wing of the Oregon Air National Guard said a single-pilot F-15C and a two-person F-15D Eagle had inadvertently reached supersonic speeds as they flew over the Pacific Ocean.
Source: https://www.independent.co.uk/news/world/americas/sonic-boom-dc-plane-crash-latest-b2352062.html