On airliners it is applied via the use of these sharp pods under 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.

On airliners it is applied via the use of these sharp pods under 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.