Airlines have reported about 3,000 cases of unruly passengers to US aviation authorities this year as bad behaviour on flights takes off during the coronavirus pandemic, APA reports citing BBC.
The Federal Aviation Administration (FAA) said 2,300 of those reports were about people who refused to wear masks.
Videos of rows over mask requirements on flights have been going viral.
This year has also seen a record number of possible violations of the law on flights.
Passengers found guilty of unruly or dangerous behaviour can face fines or possible jail time.
The agency said some 394 cases of passengers allegedly "interfering with the duties of a crew member" had been reported as of 25 May.
This is twice as many as the whole of last year, when 183 cases were investigated.
The FAA said it had investigated the highest number of potential breaches of the law since records began in 1995.