Is there another way to get there if BA is grounded?
BA has said it is rejigging its flight schedules for the period which may be affected by strikes and hopes to announce its plans soon.
Customers who have a booking between December 22 and January 2, or for 48 hours either side of those dates, can re-book to travel at a later date.
Passengers who booked through a travel agent are being advised to contact their agent.
It is not yet clear which BA flights may end up being grounded. For the latest information, go to www.ba.com.
These are some of the alternatives BA passengers may have if they find their flight has been cancelled and they still want to get away during the holiday period.
UK
The airline BMI Regional operates from airports including Aberdeen, Edinburgh, Glasgow, Leeds Bradford, Manchester and East Midlands to more than 13 destinations.
A spokesman said: "Providing an accurate number of the seats available on services where BMI and BA operate the same route isn't possible. This is because it's a dynamic figure, changing all the time."
He urged anyone who wanted to check availability to visit www.flybmi.com.
Paul Simmons, Easyjet's UK general manager said: "We have seen additional bookings over the past 24 hours and we will do whatever we can to accommodate people's travel needs over the holiday period.
"We still have over 160,000 seats available during the period on the routes that we share with BA.
"However, to put this into context, as we stand the flights are already over 75% full, so people looking to get away should act quickly."
The company said its flights from Luton, Gatwick and Stansted to both Edinburgh and Glasgow were selling fast.
Stephen McNamara, head of communications at Ryanair, told BBC News that there had been a 40% increase in activity on its website on Monday compared with what it would have expected. And traffic on the site was busy again on Tuesday.
Mr McNamara said Ryanair had only limited spaces available over the holiday and that seats were filling fast.
An Association of Train Operating Companies (Atoc) spokesman said no trains were running on Christmas Day and there was a minimal service on Boxing Day.
There would be a normal Sunday service on 27 December, followed by a Bank Holiday service on 28 December.
Atoc says people seeking cheap train tickets should visit the National Rail Enquiries website's "Cheapest fare finder" service, or the Best Value Rail Fares site.
The Christmas period would not witness the disruption due to engineering works of recent years, the spokesman said. Some 8,000 more trains, and a third fewer replacement buses are running compared with last year.
"The vast majority of people travelling should experience no disruption whatsoever due to engineering works over the Christmas period," the spokesman said.
National Express runs coaches to more than 1,000 destinations across the UK. The company points out that many of its services run to, from and between airports which could be helpful for passengers who need to switch flights.
EUROPE
Eurostar operates trains to the main hubs of Paris, Lille and Brussels where passengers can transfer to other services which will take them to many destinations.
The company runs up to 18 trains a day in each direction between London and Paris.
It says people who visit Eurostar.com can see which trains are full, which still have seats available and how much those seats will cost.
A spokeswoman said the Christmas holiday was traditionally a busy time with the start of the ski season and people visiting friends and family.
The strength of the euro has also made services to London very popular.
Airline Easyjet said seats on its short haul flights to destinations such as Nice, Barcelona, Madrid, Munich and Amsterdam were selling fast.
You can find more details on the websites of Ryanair and BMI for their services to and from Europe.
LONG HAUL
A spokesman for Virgin Atlantic said it was too early to say what the effect of the planned strikes would be until BA had published its revised schedule.
She said Virgin Atlantic would do all it could to help BA passengers to get to their destinations.
She said the company was still selling seats to all destinations, but many of its flights, including those to New York, were "incredibly busy".
BA has said it is rejigging its flight schedules for the period which may be affected by strikes and hopes to announce its plans soon.
Customers who have a booking between December 22 and January 2, or for 48 hours either side of those dates, can re-book to travel at a later date.
Passengers who booked through a travel agent are being advised to contact their agent.
It is not yet clear which BA flights may end up being grounded. For the latest information, go to www.ba.com.
These are some of the alternatives BA passengers may have if they find their flight has been cancelled and they still want to get away during the holiday period.
UK
The airline BMI Regional operates from airports including Aberdeen, Edinburgh, Glasgow, Leeds Bradford, Manchester and East Midlands to more than 13 destinations.
A spokesman said: "Providing an accurate number of the seats available on services where BMI and BA operate the same route isn't possible. This is because it's a dynamic figure, changing all the time."
He urged anyone who wanted to check availability to visit www.flybmi.com.
Paul Simmons, Easyjet's UK general manager said: "We have seen additional bookings over the past 24 hours and we will do whatever we can to accommodate people's travel needs over the holiday period.
"We still have over 160,000 seats available during the period on the routes that we share with BA.
"However, to put this into context, as we stand the flights are already over 75% full, so people looking to get away should act quickly."
The company said its flights from Luton, Gatwick and Stansted to both Edinburgh and Glasgow were selling fast.
Stephen McNamara, head of communications at Ryanair, told BBC News that there had been a 40% increase in activity on its website on Monday compared with what it would have expected. And traffic on the site was busy again on Tuesday.
Mr McNamara said Ryanair had only limited spaces available over the holiday and that seats were filling fast.
An Association of Train Operating Companies (Atoc) spokesman said no trains were running on Christmas Day and there was a minimal service on Boxing Day.
There would be a normal Sunday service on 27 December, followed by a Bank Holiday service on 28 December.
Atoc says people seeking cheap train tickets should visit the National Rail Enquiries website's "Cheapest fare finder" service, or the Best Value Rail Fares site.
The Christmas period would not witness the disruption due to engineering works of recent years, the spokesman said. Some 8,000 more trains, and a third fewer replacement buses are running compared with last year.
"The vast majority of people travelling should experience no disruption whatsoever due to engineering works over the Christmas period," the spokesman said.
National Express runs coaches to more than 1,000 destinations across the UK. The company points out that many of its services run to, from and between airports which could be helpful for passengers who need to switch flights.
EUROPE
Eurostar operates trains to the main hubs of Paris, Lille and Brussels where passengers can transfer to other services which will take them to many destinations.
The company runs up to 18 trains a day in each direction between London and Paris.
It says people who visit Eurostar.com can see which trains are full, which still have seats available and how much those seats will cost.
A spokeswoman said the Christmas holiday was traditionally a busy time with the start of the ski season and people visiting friends and family.
The strength of the euro has also made services to London very popular.
Airline Easyjet said seats on its short haul flights to destinations such as Nice, Barcelona, Madrid, Munich and Amsterdam were selling fast.
You can find more details on the websites of Ryanair and BMI for their services to and from Europe.
LONG HAUL
A spokesman for Virgin Atlantic said it was too early to say what the effect of the planned strikes would be until BA had published its revised schedule.
She said Virgin Atlantic would do all it could to help BA passengers to get to their destinations.
She said the company was still selling seats to all destinations, but many of its flights, including those to New York, were "incredibly busy".
