"U.S. raises threat level
In the U.S., authorities raised the threat level to its highest level, red, for flights coming from Britain for the first time since the security alert system was created. Other flights were on "orange" alert, one level below red.
People travelling in the U.S. endured missed connections and flight cancellations as they waited in slow-moving lines at airport security checkpoints.
In Massachusetts and California, National Guard troops were sent out to tighten security.
Extra police and dog units patrolled Dallas-Fort Worth international airport, where American Airlines is based"
In the U.S., authorities raised the threat level to its highest level, red, for flights coming from Britain for the first time since the security alert system was created. Other flights were on "orange" alert, one level below red.
People travelling in the U.S. endured missed connections and flight cancellations as they waited in slow-moving lines at airport security checkpoints.
In Massachusetts and California, National Guard troops were sent out to tighten security.
Extra police and dog units patrolled Dallas-Fort Worth international airport, where American Airlines is based"