Clean Air.

Based on enthusiastic response from passengers and flight attendants, United Airlines has extended its test of smoke-free international flying to three routes serving London's Heathrow Airport: San Francisco, Los Angeles, and Washington, D.C. (Dulles). However, one of the two daily flights to London from those cities will still allow smoking. United began the test on Mar. 1 on its New York-to-London and Los Angeles-to-Auckland routes.

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