Vilnius did not close because a drone was proven. It closed because a radar return was close enough to one that Lithuania would not leave the runway open. The National Crisis Management Centre issued a yellow air alert shortly after 13.00 local time on 13 September. Arrivals and departures at the capital airport stopped. NATO summoned at least one fighter from Siauliai, where Italian aircraft are flying Baltic air policing. The jet made a visual pass. The marks were a flock of birds. The centre said birds and drones can look similar on first radar. The alert came down. The field was moving again in about 38 minutes, with some official timing putting the reopen nearer 13.52. That is the verified sequence. It is also the civil-aviation problem in miniature. A small or even imaginary object can stop a national gateway. The first decision has to be safety. The missing piece is a playbook that can tell a tower, within minutes, whether the object is a hobby airframe, a false paint, a surveillance drone or a weapon, and then tell the same tower when it is legal to open again.
Lithuanian Airports said two inbound flights diverted to Kaunas, about 85 kilometres away. Tracking reports described a Warsaw service that turned back and another aircraft that started toward Gdańsk before returning to Vilnius once the alert lifted. No official passenger total or cancellation list has been published, and no quarterly airline filing isolates the hour. Those gaps matter. Impact should be counted from named flights, loads and fuel, not from a borrowed “cost per closure” number that does not exist in the record. No statement named a civil counter-drone system that locked or jammed a target, because the identifier was a fighter pilot. Civil closure sat with the crisis centre. The intercept sat with NATO’s policing mission. Residents in Vilnius, Trakai and Elektrėnai received shelter messages that were later withdrawn. The city marathon continued. The hour still cost holding fuel, crew legality, missed banks and two extra landings at Kaunas.
Europe and Asia keep repeating the same first hour. Amritsar held and diverted on a possible drone and later investigated cameras near a village event. Hanover lost nearly two hours on a sighting. Tan Son Nhat scattered dozens of flights. In each case the airport did what the rule requires when the object is unidentified in the approach path. It stopped. What none of them yet share is an evidence threshold for reopen. How many sensors must agree. Whether a visual from a jet, a police helicopter or a ground camera is enough. Who may use a jammer beside a passenger runway. How holding, diversions and hotels are paid when the threat dissolves into birds. Until that standard exists, a flock and a hostile airframe will keep buying the same first closure, and the only difference will be the statement that follows.