There were flights between SXF and BTS
Other destinations that have been tried (and subsequently rejected) by easyJet since opening the base in 2004 include Bratislava, Krakow, Ljubljana, Maastricht/Aachen, Newcastle and Valencia. The Bratislava route, started in November 2004, was originally planned as double-daily but frequencies rapidly melted away and the route was chopped after just five months to be replaced by Maastricht/Aachen which had a near identical sector length. This route fared slightly better but was still axed in January 2007 after less than two years.
easyJet cuts routes, frequencies as Berlin competition intensifies | anna.aero