Cardiff City and the Air Charter Association have called for urgent action against illegal flights following the plane crash which led to the death of Emiliano Sala.
Sala was flying to Cardiff in January, after his transfer from French side Nantes, when the plane piloted by David Ibbotson crashed into the English Channel. The body of Mr Ibbotson has not been found.
In a preliminary report, the Air Accidents Investigation Branch (AAIB) found the pilot was not licensed to fly fee-paying passengers and the plane itself was not registered to undertake commercial fights.
The Air Charter Association, the body which represents air charter companies, has called on the UK Government to review the level of criminal liability and enforcement options available to authorities, including bigger fines and prison sentences for pilots and individuals who arrange and undertake illegal flights.
"This must be a watershed moment," said chief executive Dave Edwards.
"We have long argued that illegal flights are harming the legal air charter industry and putting lives of the travelling public at risk.
"It has become so prevalent that there is circumstantial evidence to suggest illegal flights are routinely happening frequently throughout the country.
"We desperately need stronger punishments to be available and, most importantly, better enforcement."