The biggest change in 50 years to Air Traffic Control (ATC) at the world's busiest international airport takes places this weekend when operations switch to the new control tower at London Heathrow.

Switchover is times for 0200 on Saturday morning (April 21) when the airport is at its quietest. Heathrow is the most intensively used airport in the world, with up to 90 arrivals and departures an hour during the operating day, 365 days a year.

Reduced landing rates will be temporarily in place during the transition. Further details of the transition can be found at www.Nats.co.uk bmi is working closely with BAA and Air Traffic Control to minimise any disruption, however flights may be subject to some delays. Passengers are advised to check in as normal.