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Tower en route control
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<p>In <a href="/facts/United_States/P0sCdLe5">United States</a> <a href="/facts/Aviation/HX5MHY71">aviation</a>, tower en route control (TEC) is a collection of published low-altitude, short-distance <a href="/facts/Instrument_flight_rules/RPfLUgbe">IFR</a> routes through large metropolitan areas that require no level of <a href="/facts/Air_traffic_control/G2cQebVb">air traffic control</a> higher than approach-control facilities. </p>