Air travellers are enduring another 24 hours of chaos as a general strike takes place in Spain, a day after air traffic controllers across Europe took industrial action.

BBC News Online has compiled an at-a-glance guide to how the main airlines operating in the UK are affected and where to go for help.

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British Airways

Cancelled on Thursday:

• Four return flights between London Heathrow and Madrid - BA456/7; BA458/9; BA460/1; BA464/5.
• Three return flights between London Heathrow and Barcelona - BA478/9; BA480/1;BA484/5.
• Three return flights between London Gatwick and Madrid - BA2464/5; BA2466/7; BA2468/9.
• One return flight and two additional single flights between London Gatwick and Barcelona - BA2485; BA2486/7: BA2490.
• One return flight between London Gatwick and Bilbao - BA2478/9.
• One return flight between Manchester and Madrid - BA1640/1.

Passengers will be automatically booked on the next available flight, or be given flight vouchers.

Customers are being advised to telephone the airline on 0845 7799977 to check the latest status of flights or to visit the website -

Delays are expected.

Buzz

The company says flights to Murcia on Thursday are not affected by the Spanish air traffic control strike, and passengers are advised to check in as normal.

Go

Cancelled on Thursday:

• GO 337 London Stansted to Bilbao
• GO 338 Bilbao to London Stansted
• GO 798 London Stansted to Barcelona
• GO 797 Barcelona to London Stansted
• GO 795 London Stansted to Barcelona
• GO 796 Barcelona to London Stansted
• GO 663 London Stansted to Alicante
• GO 664 Alicante to London Stansted
• GO 672 London Stansted to Alicante
• GO 671 Alicante to London Stansted

Fourteen other flights have revised departure times.

Passengers whose flights have been cancelled or re-scheduled and who want to re-book, should contact the Flight Change Team on 0870 243 4242 between 0900 and 1800 BST.

Easyjet

Easyjet is planning to run many flights to Spain from Luton Airport, but a few have been cancelled.

The company says plans may change during the day, so passengers should continue to check its website.

Affected passengers who need to rearrange travel plans, should call the Easyjet Call Centre by 28 June on 0870 6 000 000 to arrange a free transfer onto another service on the same route.

There is also an online refund claim form on the company's website at

British Midland

Cancelled on Thursday:

• BD480 / 485 / 486 to and or from London Heathrow and Madrid.
• BD163 / 164 to and from London Heathrow and Palma.

For more details log on to the press centre at the website of