Thousands of air passengers have seen their travel plans disrupted after an air traffic control problem grounded nearly 2,000 flights across the UK.
When a flight is cancelled or delayed, passengers affected have various rights â such as a refund or be put on another flight. However, these can vary depending on which carrier you are flying with and from where.
Only when an airline is at fault - not issues such as air traffic control problems - is extra compensation payable. Here's what it means for you.
When flights are delayed or cancelled, UK and EU airlines, and other carriers when you are departing a UK or EU airport, have a duty to look after you.
The reason for the delay or cancellation does not matter. So anyone affected by the air transport delays will be eligible.