Bosses at Cotswold Airport have issued a stark warning after dozens of people were been caught sneaking in through the venue's gates.
The Gloucestershire airfield is being used to store and scrap Boeing 747s and other large passenger planes.
Visitors are allowed to see the British Airways and Corsair passenger jets - but only on certain days.
Chiefs are growing increasingly concerned after CCTV footage has captured dozens of people attempting to enter the site illegally.
"This is a very active airport on privately owned land," an airport spokesperson wrote on Facebook.
"Whilst we encourage visitors to come and watch the aircraft, it is NOT a leisure facility, space for learning to drive, walk dogs or play sports.
"The airport (and access gates) is closed on Sundays and Mondays to non based pilots and the public.
"Our based aircraft will still operate on these days. For your safety, please, don't try and sneak in through the gates, so many have been recorded on CCTV doing so."
A growing number of large passenger jets are currently being stored or scrapped at the airfield on the Gloucestershire and Wiltshire border, including the last three Corsair 747s.
The airport, which sits between the A429 and the A433, re-opened to the public at the beginning of July. Visiting times for the site are between Tuesday to Saturday 9am to 5pm.
"Our restaurant is not yet open, but our staff have opened the burger van to provide food and drinks, but seating space is limited, " said the spokesperson.
"For this reason, seating is reserved for pilots needing a seat to plan their next leg or return flight and for AV8 customers to sit and enjoy a delicious burger."
Most of the 747s parked at the Kemble site can be seen from the A429 side of the airfield.
