EuroAirport Basel Mulhouse Freiburg (IATA: MLH, BSL, EAP, ICAO: LFSB, LSZM) is an international airport3.5 km northwest of the city of Basel, Switzerland, 20 km southeast of Mulhouse in France, and 46 km south-southwest of Freiburg im Breisgau in Germany. The Franco-Swiss administered airport is geographically located within the French Alsace region, in the administrative commune of Saint-Louis near the border tripoint between France, Germany, and Switzerland. Due to its international status, EuroAirport has three IATA airport codes: BSL (Basel) is the Swiss code, MLH (Mulhouse) is the French code and EAP (EuroAirport) is the neutral code. The ICAO airport code is: LFSB, sometimes LSZM is used to designate the Swiss airport
Plans for the construction of a joint Swiss–French airport started in the 1930s, but were halted by the Second World War. In 1946 talks resumed and it was agreed that an airport would be built 4 kilometres (2.5 mi) north of Blotzheim, France. France would provide the land and the Swiss canton of Basel-Stadt would cover the construction costs. Basel-Stadt's Grand Council agreed to pay the costs for a provisional airport even before an international treaty was signed (which was not until 1949). Construction began on 8 March 1946 and a provisional airport with a 1,200-metre (3,900 ft) runway was officially opened on 8 May.
Today the airport serves as a base for easyJet Switzerland and features mainly flights to European metropolitan and leisure destinations.

FLICKR GALLERY
Spotting Guide
My experience is as of October 2015 :
EuroAirport Basel Mulhouse Freiburg (IATA: MLH, BSL, EAP, ICAO: LFSB, LSZM) is an international airport 3.5 km ; northwest of Basel in Switzerland, 20 km ; southeast of Mulhouse in France, and 46 km south-southwest of Freiburg im Breisgau in Germany. It is located in France, on the administrative territory of the commune of Saint-Louis near the Swiss and German borders. The airport serves as a base for easyJet Switzerland and Belair, which operates on behalf of Air Berlin, and features mainly flights to European metropolitan and leisure destinations.

Location : Spot 1 "Belvedere Park" by car from airport drive to direction “St Louis / Blotzheim” after the tunnel turn on right and take a small road. Walk to the hill and you will find the platform
Authrization : Not required
Security : Any problem, if the rules are respected
Weather : European weather
Time / Light : The light conditions are good from 1:30 PM until sunset.
Traffic :
Car : is absolutely necessary

The platform of Belvedere Park

You can get an idea of the views if you see below at my planespotting gallery
NB : If you have some informations, feedback or any update about this Don't hesite to write ......