ASL Airlines Switzerland AG is a Swiss airline. It operates regular express parcel services from Switzerland and Germany to the main hubs in Europe. It also specialises in operations for humanitarian organisations, the oil industry and other special operations. Its main base is EuroAirport Basel-Mulhouse-Freiburg. Its head office is in Bottmingen, Basel-Landschaft.

The airline was established and started operations in 1984. It was part of the FARNAIR Group, which comprises four airlines, FARNAIR Switzerland and FARNAIR Hungary, Quikjet India and a share of 45% in K-Mile Air Company Ltd. plus FARNAIR Handling and FARNAIR Training operating under the widely recognised "FARNAIR Europe" trademark. FARNAIR's main freighter activities include operating European network feeder services for the integrator and third party logistics industries and ad-hoc charters for manufacturers and freight forwarders where immediate launch is required. The main passenger activities include supplying aircraft to governmental and relief agencies, ACMI services for regional airlines and ad-hoc flights for the events industry with an ATR72, 46 seats turboprop aircraft. In December 2014 the FARNAIR Group was acquired by Ireland-based ASL Aviation Group.

On 4 June 2015, ASL Aviation Group announced that Farnair Switzerland will be rebranded as ASL Airlines Switzerland.

The head office is located in Bottmingen, Basel-Landschaft. The head office moved to its current location, in proximity to EuroAirport Basel-Mulhouse-Freiburg, on August 2015. The airline's head office used to be on the Swiss side of EuroAirport Basel then in Allschwil, Basel-Landschaft.

The ASL Airlines Switzerland fleet comprises the following aircraft (as of August 2016):

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