Two radical were temporarily detained by constabulary aft reports of a suspicious bundle meant Gatwick Airport's South Terminal was evacuated.
The South Terminal, 1 of 2 astatine the airport, was unopen astatine 10:55 GMT connected Friday portion an explosive ordnance disposal squad "made the bundle safe".
Sussex Police confirmed this day that 2 radical were detained but person since been allowed to proceed with their journeys.
The terminal is present reopening for passengers, who are being warned of continuing delays and cancellations.
A spokesperson for Gatwick Airport told the BBC that "there person been astir 40 cancellations contiguous pursuing today's disruption, retired of implicit 240 scheduled flights".
Earlier connected Friday, thousands of stranded passengers were near waiting extracurricular the terminal successful near-freezing temperatures, with galore saying they had nary thought what was going on.
"No-one seems to cognize what they are doing," said John Mather, who flew into the South Terminal from Costa Rica during the closure.
"We were past bussed to the North Terminal, wherever we went done migration and collected our bags. [We had] nary assistance whatsoever from airdrome oregon information staff."
Mr Mather, who lives successful Croydon, said that due to the fact that the trains were not stopping astatine Gatwick, helium would beryllium forced to locomotion to the presumption successful Horley - much than fractional an hr away.
"It's hopeless, I'm stuck here," helium said.
Trains person since resumed calling astatine Gatwick.
Another stranded rider was Gabriele Lecce, who had been hoping to alert to Rome but was told determination was an contented erstwhile helium arrived astatine departures.
“Fifteen minutes later, we saw the constabulary coming and they evacuated america - we're freezing retired here," helium told the BBC.
Many radical person been forced to marque alternate question plans, similar Emily Fisher and her 3 friends, who person paid £1,200 betwixt them for caller tickets to Budapest, travelling from Luton Airport instead.
"We got to [Gatwick] airdrome astatine 11:00, determination were hundreds of radical outside," said Emily.
"They said the terminal was connected lockdown but the radical astatine the airdrome were telling america they didn’t cognize anything."
Travel writer Simon Calder said astir 100,000 passengers were owed to alert successful and retired of Gatwick Airport connected Friday - fractional of those done the South Terminal.
Now, passengers accidental they are "cautiously optimistic" arsenic they committee shuttle trains to the South Terminal.
“Until we’re connected the plane, we can’t relax," said Alaia, 18, who is trying to get location to Barcelona.
"I’m disquieted that truthful galore planes are delayed that immoderate won’t really instrumentality off."
A spokesperson for Gatwick Airport said passengers should cheque the presumption of the formation with their airline.