For example, jumping into an IBJ without HiJump, which can be done from an angle down jump or a spin jump.
This can also sometimes have applications while dodging enemies or while taking damage from them.
Damage boosting can be tricky, as it requires holding both backwards and jump until Samus lands; releasing either too early will use the flash suit.
It is possible to morph and unmorph midair to switch from a "jumping" to "falling" state, in order to be able to aim up or diagonally up while midair;
one common reason to do this is to grapple across a ceiling, which requires a morph and unmorph between each swing.
See also: Tech Page