New York’s LaGuardia Airport started using its new, $100-million control tower that replaced the 46-year-old tower, last month. The new tower offers better visibility and technology for Federal Aviation Administration air traffic controllers that will help reduce flight delays. The new tower uses a ground radar system that provides better information about aircraft on runways and taxiways, and gives transponder information about a plane’s destination. LaGuardia was used by 22.1 million passengers in 2009.