En español | As the summer travel season begins, you’ll want to pay extra attention to flights you book to certain airports. 

MileCards.com crunched numbers related to on-time arrival data from the U.S. Department of Transportation from 2007 to 2016. Of the 50 busiest airports in the United States, 40 percent had more summer delays than winter delays. Indeed, June is the worst month for delays in the summer, the analysis found.

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Looking at the top 50 airports, Newark Liberty International (New Jersey) was worst for summer delays, according to the report. The others in the top ten list include LaGuardia (New York), San Francisco International, John F. Kennedy International (New York), Logan International (Boston), O'Hare International (Chicago), Philadelphia International, Miami International, Ronald Reagan Washington National and John Glenn Columbus International (Ohio). 

The airports with the best on-time arrivals were Kahului and Honolulu International (both in Hawaii), Salt Lake City International, John Wayne Airport (Orange County, Calif.), Phoenix Sky Harbor International, Portland International (Oregon), Seattle-Tacoma International, San Jose International (California), Minneapolis-St. Paul International and McCarran International (Las Vegas).

In a statement to AARP, MileCards.com said they used arrival data opposed to departure data because a late departure can still mean an on-time arrival if a pilot can make up the time in the air.   

If Memorial Day weekend was a sign of what’s to come, expect busier airports this summer. A recent report by AAA estimated air travel increased by 5.5 percent over Memorial Day 2016.  It’s predicted a record 234 million people will travel this summer.  

To avoid possible delays this summer, MileCards.com offered a few suggestions.

• If severe weather is in the forecast, check to see if your airline is offering to waive change fees. You may be able to leave earlier to avoid the severe weather or go later.

• Be selective of airports you connect through.

• Early morning flights are less likely to face delays.

As you travel this summer, you also want to be mindful of security changes at certain airports. AARP reported last week on a program that the Transportation Security Administration is testing at certain airports, requiring you to remove more than just your laptop at security checkpoints.  

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