Mid-air retrieval

Mid-air retrieval is a technique used in atmospheric reentry when the reentering vehicle is incapable of a satisfactory unassisted landing.

This is a risky technique, and so is only used when other forms of landing are infeasible.

Successful mid-air retrieval requires correct operation of the retrieving aircraft, favourable atmospheric conditions, and successful execution of a tricky manoeuvre, in addition to correct operation of the vehicle itself.

These risks can be mitigated somewhat: for example, multiple recovery aircraft can be used.

The need for human aviators to perform a manoeuvre which would normally be classed as a stunt may in the future be avoided by advances in unmanned aerial vehicles and spacecraft reentry.

A helicopter with a long hook can catch a parachuting object in mid-air, as seen here in a practice run for the planned retrieval of Genesis .