The Transportation Security Administration faces the challenge of balancing security and efficiency as it copes with terrorist threats. Airlines said operations are returning to normal but more travelers are checking luggage after a foiled terrorist plot spurred officials to prohibit travelers from taking liquids into aircraft cabins. The owner of London's Heathrow Airport said airlines will cut 20% of flights from the airport to cope with tougher security measures. Meanwhile, the U.S. has downgraded its terror alert level for flights between the U.S. and U.K.
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