If you're passing through an airport this weekend, expect huge crowds and heightened security measures. The crowds are due to the July Fourth holiday, of course. The heightened security comes in response to suicide bombings by suspected Islamic State militants at Istanbul's main airport, where 41 people were killed and 239 injured.
Airports have been reluctant to get specific about what they're doing to reduce threats, lest they tip off the bad guys. But experts predict the focus will be on areas outside of security checkpoints, because the Istanbul attack took place in a spot not subject to screening. That might mean more surveillance and armed patrols in those areas. The airports' increased vigilance will also probably involve more passenger searches in the security line, resulting in delays. When you're deciding what time to leave for the airport this weekend, you might want to allow an extra 30 to 45 minutes for working your way through security.