Britain's airports are warning travelers they could face major delays Thursday when civil servants and teachers plan to take part in a nationwide strike.
BAA, which runs Heathrow, Stansted, Edinburgh, Glasgow, Aberdeen and Southampton airports, made the statement Wednesday.
Nearly three quarters of a million teachers and civil servants are planning to walk off the job Thursday due to a dispute over pensions.
Four trade unions voted to strike on June 30.
Prime Minister David Cameron made a final plea Tuesday to persuade the workers to abandon the strike.
Some information for this report was provided by AP, AFP and Reuters.