Airline shuttles operating between New York, Boston and Washington depend on quick turnarounds and reliable service to serve business travelers efficiently. Some observers say long security lines and the end of policies that guarantee travelers a seat has weakened the basic shuttle formula. "There was a time when the shuttle routes were the busiest markets in the country," said Joe Brancatelli, who runs a business travel Web site. "But the shuttle's moment, and it was a glorious moment, may have passed."
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