British Airways cabin crew will begin a three-day strike over pay today.
BA say a small number of short-haul services to and from Heathrow will be cancelled.
All long-haul flights to and from Heathrow, Gatwick and Stansted, as well as all flights to and from London City, will run as normal.
Southern Rail drivers are striking for the third day this week.
Passengers will again face disruptions to their journeys as members of the Aslef union take action against driver-only trains.
Another three-day walkout is planned for later in the month.
Commuters will have their journeys disrupted again today as Southern Rail drivers continue to strike.
Hundreds of thousands of passengers were affected yesterday, with another walkout planned for Friday.
The action is part of a dispute over driver-only trains.
The company had been hoping to block tomorrow's strike by the Aslef and RMT unions at the last minuteRead the full story ›
Commuters have expressed their anger at a poster telling passengers they should not even attempt their journeys during fresh strikesRead the full story ›
A two day strike by London Underground workers is set to go ahead next week after last ditch talks broke downRead the full story ›
Bus drivers are to be balloted for strikes in a row over pay and conditions.
Members of Unite working for Abellio in Surrey will vote over the next fortnight on whether to launch a campaign of industrial action.
The union claimed pay and conditions were being "salami sliced".
Some Barnet council workers will strike today, over a dispute about the outsourcing of council services. The council is looking at more affordable ways to deliver services including for libraries, street cleaning and school meals.
Barnet Unison claims more than 80% of staff could end up working for a different employer under the changes. Today's strike is part of 6 weeks worth of action.
Docklands Light Railway workers are to be balloted over strike action due to disputes over pay and conditions. Members of the Rail, Maritime and Transport union will vote in the coming weeks, with a result expected on May 12.
There are two separate disputes involving this year's pay deal for directly employed staff and another row over wages for employees at the facilities company Interserve.
RMT general secretary Mick Cash said: "Our reps are in no doubt that we need to send a clear message to management that staff are prepared to fight to demand decent rewards and recognition, a safe working environment, decent working conditions and will not be forced into accepting inferior pay arrangements."