If you're heading to Europe this summer, you can expect to encounter strikes that could interfere with your travel plans. First up is a refusal of train drivers on the Gatwick Express and Southern trains to work overtime, which means some cancellations. A potentially more disruptive 24-hour strike is planned for July 10.

Meanwhile, some British Airways cabin crew members plan a strike July 1-16 that will likely cause some schedule disruption.

You can also speculate that French President Macron's plan to revise the nation's labor laws will lead to strikes and demonstrations somewhere down the line-perhaps as early as this summer.

The take-away: Check about possible problems with airlines and various news sources before you leave.