The Federal Aviation Administration (FAA) may revoke the pilot's license of a 65-year-old navy veteran who landed his plane on the Marriott Lincolnshire Golf Course in Illinois on Saturday.

FAA spokeswoman Elizabeth Isham Cory said an investigation into Robert Kadera's weekend stunt is ongoing. Civil penalties for landing an aircraft without clearance could result in revoking the pilot's certification.

Kadera, an engineer with about 40 years of flying experience, flew his 14-year-old son Isaac in a four-seat 1949 Piper Clipper from their Lake Villa home to the golf course in Lincolnshire across a highway from the tennis club.

They boy was running late for a scheduled tennis date so they took the plane instead.

Lincolnshire Police Chief Randy Melvin said the plane had to circle twice before touching down at Crane's Landing golf course. Witnesses had called the police, fearing there had been a crash.

Following the stunt, Kadera wasn't even allowed to fly his plane home; he ended up hiring a towing company.