The growing certainty that the mid-air destruction of a Metrojet airliner flying from Sharm el-Sheikh to St Petersburg was caused by a bomb placed in the baggage hold has led to predictable calls from politicians for tighter airport security across much of the world. "What we have got to do is ensure that airport security everywhere is at the level of the best," said Philip Hammond, Britain's foreign secretary. "That may mean additional costs; it may mean additional delays at airports as people check in." The deaths of 224 people aboard the Airbus A321 is a tragedy. But if passengers groan at evermore intrusive security screening, they are right.
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