automatic pilot 
noun
A device for keeping an aircraft on a set course without the intervention of the pilot.Disengage the automatic pilot and contact the control tower for clearance....
- The speed valves control the rate at which the automatic pilot reacts to bring the airplane back on its course.
- After climbing out and disappearing from sight above the clouds, the pilot switched on the automatic pilot and sat back, the story goes.
Phrases
on automatic pilot
- of one's own
- of one's own accord
- of one's (own) making
- of (or by or on) one's own volition
- of (or for) a surety
- of (or from) the old school
- Ofrail
- of some size
- of sorts
- Ofsted
- oft
- Oftel
- often
- oftenness
- oftens
- oftentime
- oftentimes
- of the blood (royal)
- of the essence
- of the first magnitude
- of the first order (or magnitude)
- of the first water
- of the moment
- of the order of
- oft-time