US aviation authorities are seeking the maximum €7,700 fine against the man behind the balloon boy hoax.
The Federal Aviation Administration released a letter that it sent to Richard Heene with the proposed fine, on the grounds that he operated a balloon in a hazardous manner.
On October 15, Heene reported his son was aboard a large saucer-like balloon that had floated away. The balloon later landed with no sign of the boy, who was safe at home.
Heene and his wife both received jail sentences on Wednesday.
The FAA said flights from Denver International Airport were temporarily halted and planes were diverted during the balloon’s flight.
Heene’s lawyer, David Lane, said he was crafting a response to the letter.