What physical feature contributes most to the Harrier's signature slow flight style?

Answer

Proportionally the longest tail of any raptor in North America coupled with long, narrow wings

The combination of a very long tail relative to its size and long, narrow wings allows the Harrier to fly exceptionally slowly without stalling, described as mothlike buoyancy.

What physical feature contributes most to the Harrier's signature slow flight style?
birdanimalspeedflightHarrier