As the crow flies and By a direct route

As the crow flies adverb - By the shortest and most direct route.

By a direct route and as the crow flies are semantically related. In some cases you can use "By a direct route" instead an adverb phrase "As the crow flies".

As the crow flies and by a direct route are semantically related. You can use "As the crow flies" instead an adverb phrase "By a direct route".