The Icelandic volcano ash cloud drifting over Northern Europe grounded hundreds of flights, frustrating travelers.
Experts suggest that the volcanic ash from Iceland's Grímsvötn could once again snarl British air traffic later this week.
After criticism of its initial response to the threat of Yemeni cargo-hold bombs, Britain is moving to close loopholes surrounding freight transportation and tighten vetting of travelers.
Airports in Ireland were shut for about eight hours on Tuesday as winds carried ash from the Icelandic volcano into flight paths. Though travel is now getting back to normal, meteorologists say summer winds could lead to more disruption at European airports.