Jeju Air is an airline based in Jeju City, Jeju-do, South Korea, offering scheduled domestic services between Jeju and the South Korean mainland out of Jeju International Airport or Gimpo International Airport, Seoul. Also, a number of regular charter flights is operated

Jeju Air was established in January 2005 and began operations on June 2, 2006. It is owned by the Aekyung Group (81.7%) and the Jeju Provincial Government (4.54%). On July 11, 2008, Jeju Air made its first international flight from Jeju to Hiroshima.^{[citation needed]}

Jeju Air operates scheduled flights to the following destinations:^{[dubious – discuss]}

As of March 2012, the Jeju Air fleet consists of 10 Boeing 737-800 aircraft.

In 2005, the airline placed an order for 5 Dash 8-Q400 aircraft (with options on 3 further aircraft), with a total contract value of 196 million USD if all options were exercised. These aircraft remained in the fleet only for a short period, the last one was withdrawn on 16 June 2010 and sold to Aires Colombia.^{[citation needed]}

Jeju may refer to:

The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation).

Atmospheric stratification describes the structure of the atmosphere, dividing it into distinct layers, each with specific characteristics such as temperature or composition. The atmosphere has a mass of about 5×10¹⁸ kg, three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface. The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space. An altitude of 120 km (75 mi) is where atmospheric effects become noticeable during atmospheric reentry of spacecraft. The Kármán line, at 100 km (62 mi), also is often regarded as the boundary between atmosphere and outer space.