US Air was initially known as All-American Airways in 1939, then morphed into Allegheny Airlines, after which it became US Air. As of 2015, following several mergers, its name is US Airways. More » Geography

The air handler is the indoor part of the HVAC unit that contains a blower and coils for heating and cooling. In a HVAC system that uses a fossil fuel, the air handler contains the heat exchanger, which is a firebox that... More » Home & Garden Heating & Cooling

An air handler, also called an air handling unit or AHU, is used to circulate and condition indoor air. Air handling units include filters, fans, heating and cooling coils, air control dampers and filters. Smaller air ha... More » Home & Garden Heating & Cooling

Allegheny Airlines was an airline that operated out of Pittsburgh, Pennsylvania, and was headquartered at Washington National Airport in Arlington County, Virginia, from 1952 to 1979. It is the predecessor of what is now... More » Geography

As of 2015, customers can book flights on Lion Air through either the airline's website, third-party travel and ticket booking websites, or through the official Lion Air application on smartphones. Prospective Lion Air f... More » Geography

Smithsonian Museum tours include the Air and Space Museum, Natural History Museum, American History Museum and the National Gallery of Art Museum. The Smithsonian also offers outdoor walking tours of public places and pr... More » Geography

The Smithsonian museum complex in Washington includes several interesting museums with free admission, such as the Air and Space Museum, the Natural History Museum and the American Indian Museum. Travel.NationalGeographi... More » Geography