It is possible to deploy multiple F-35 radars, which then could provide added flexibility by permitting Airborne Warning and Control System coverage elsewhere.

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Japan owns four Boeing E-767 airborne warning and control system aircraft.

WSJ: Japan: Russian Fighter Jets Enter Its Airspace

Once they arrive at Cardiff, fans will be marshalled under a crowd control queuing system - police are warning long waits can be expected.

BBC: Capital ready for FA Cup final