Police have charged 17-year-old Ballarat boy with multiple offences after he tried to board a Sydney-bound flight at Avalon Airport.

The young man from Victoria, who was dressed in high-vis similar to airport ground crew, was tackled to the ground by passengers.

Three heroic passengers were able to detain a 17-year-old boy who allegedly dressed as a maintenance worker to board a Jetstar flight at an Australian airport — with a shotgun and ammunition, police said.

The 17-year-old from Ballarat was said to have been attempting to take the large weapon onto a Jetstar plane at Avalon Airport in Melbourne on Thursday afternoon

A 17-year-old boy armed with a shotgun and ammunition was overpowered by passengers after breaching security and boarding a Jetstar flight at Avalon Airport near Melbourne on Thursday. Dressed in hi-vis gear,