After a technical fault with the air traffic control system prevented takeoffs and landings for hours, Zurich and Geneva airports resumed operations on Wednesday.
Flights will operate at 50% capacity and at 75% capacity respectively
Travelers are urged to look for flight information on airlines’ websites.
Eurocontrol, the European air traffic control organization, issued an alert warning airline to expect “significant delays.”
Air travel has progressively resumed since 8.30 a.m., according to Geneva Airport.
It announced on Twitter that many flights had been canceled and advised passengers to check with their carriers to see whether their trip was still on.
After a technical issue, the Swiss air traffic control organization Skyguide announced it has closed Swiss airspace to safeguard safety.
According to FlightRadar24, Zurich airport had 330 flights booked on Wednesday, while Geneva had 211.