New plans to combat the threat of terrorism at Gatwick Airport are set to be unveiled.
Travellers are warned not to take sharp objects in their hand baggage
Sussex Police and airport operator BAA are joining forces to ask for vigilance from those who know Gatwick well - from staff to plane-spotters.
Posters and leaflets containing details of activity police want to hear about are to be given to airport staff.
Police said it made sense to take advantage of the thousands of people who are at the airport every day.
Security at the airport in West Sussex has been tightened since the attacks on New York in 2001, with an extra 200 security staff employed in 2003.
But while x-ray machines used at check-in controls can spot terrorist devices, police want extra sets of eyes to look for potential terrorists themselves.
Ch Supt Phil Clarke said: "We want everyone who uses the airport to work in partnership with the police and BAA to keep Gatwick safe.
Police want people to be aware of anything out of the ordinary
"Officers will be encouraging staff to look at the behaviour of others and to be alert to strangers asking about the type of job they do.
"Information in the guides and on posters will remind staff to stay alert to people asking about their uniform, their training or the security in place.
"Drivers of buses, taxis, minicabs and delivery vehicles are another section of the airport community that the police are keen to encourage to remain vigilant, as are aviation enthusiasts.
"The people who know the airport well are best placed to spot behaviour or objects that are out of the ordinary.
"If an activity concerns them, then it will almost certainly be of concern to the police and airport security staff."