Aren't there keys for planes?

Slaying suspect steals plane in Utah, crashes, then kills himself

Excerpt:

A man wanted in connection with a slaying in Colorado stole an airplane from a Utah airport Tuesday, then crashed it and killed himself with a shot to the head, officials said.

The man was identified as Brian Hedglin, 40, an employee of SkyWest, said Marc Mortensen, assistant to the city manager of St. George, Utah; the city of about 80,000 people is in the southwestern corner of the state.

Hedglin threw a rug over a razor wire fence at the St. George Municipal Airport early Tuesday, Mortensen said in a telephone interview with the Los Angeles Times. Wearing leather gloves, Hedglin climbed over the fence and got access to a SkyWest jet about 12:50 a.m.

Comment: So aren't there keys / locks for planes? If not, shouldn't there be! The plane is a Bombardier CRJ200 - looks like a shortened DC-9