On airliners it is applied via the use of [these sharp pods under wings](https://aviation.stackexchange.com/questions/7955/what-is-the-purpose-of-the-sharp-pods-under-airliner-wings).

A coke-bottle-like fuselage would be extremely impractical for internal arrangement and cargo loading, so it is not done on airliners even though it could probably improve the efficiency a bit.

What is done is:

 - The engines shifted ahead of the wing help smooth out the increase of cross-sectional area around the wing leading edge.
 - The enlarged flap track fairings, a.k.a. anti-shock bodies help smooth out the decrease of cross-sectional area around the wing trailing edge.