Hundreds of thousands of British Airways passengers will see their travel plans disrupted again after the airline canceled more than 10,000 flights.
There have been more votes by rail unions to strike at operators such as LNER.
The chaos over the Easter and half-term breaks was caused by a lack of staff at airlines and airports.
Due to labour shortages and threatened strikes at its main hub, it will scrap an average of 100 flights a day.
There are more multiple daily departures on major city routes for short-haul flights in the latest round of cancellation by British Airways.
It follows a similar number of pre-emptive cancellation made in early May for the entire summer season, and comes on top of a relatively small number that was axed last week.
The airline said it was focused on building resilience into its operation to give customers the certainty they deserved.
The latest trimming of the schedules, which took out almost one in seven of the flights originally on sale, has been enabled by the government's "slot amnesty"
It has allowed BA and others to reduce their operations this year without giving up their valuable landing slots at busy airports.
The government recently decided to give the entire industry a break. It's the right thing to do for our customers and our colleagues when we don't want to be. We can further reduce our schedule and consolidate some of our quieter services so that we can protect as many of our holiday flights as possible.
It said most flights were unaffected and the majority of customers would get away as planned, but it added that they were doing everything they could to get their travel plans back on track. We are in touch to apologize and offer rebooking options for new flights with us or another airline as soon as possible.
The impact of rail strikes this summer could be increased by hundreds of more staff voting for industrial action.
The long-distance East Coast operator and the Essex commuter service c2c have both voted to go on strike, despite the fact that those at Northern did not. Similar votes were cast for strikes at Cross Country and East Midlands on Tuesday.
The union wouldn't immediately call for industrial action, but would consider the next steps with workplace representatives. The Commonwealth Games could be affected at the end of the month.
The members of the TSSA work in a variety of roles for train companies.
The signallers who went on strike allowed a limited number of trains to run on major lines. A strike could cause services to stop. Network Rail is the site of the strike ballot.
The results of votes at nine train operating companies will be announced on the same day by the Aslef union, which represents train drivers.