Bregenz-based airline InterSky had significantly more passengers last year than in 2009.The company announced today (Fri) it registered 250,000 clients in 2010, up from 185,000 in 2009 and 210,000 in 2008. InterSky said it wanted to grow further, but “will only invest money which we earned.”The carrier, which focuses on business travellers, said its target was to have 550,000 passengers a year by 2014.InterSky was founded in 2001. It had a turnover of 29 million Euros last year. The carrier said today it wanted to double this figure by 2014.InterSky is headed by Claus Bernatzik. The airline offers flights from the German aerodrome of Friedrichshafen Airport (FDH) which is located just a few kilometres from the German-Austrian border to Vienna International Airport (VIA or VIE) and airports in the German cities of Berlin, Hamburg and Dusseldorf among other destinations.InterSky is currently bracing itself for a tougher economic environment as another regional carrier started operating from an airport situated less than 70 kilometres from FDH earlier this week.Peoples Viennaline, an airline managed by textiles industry entrepreneur Markus Kopf, offers up to three daily flights between St. Gallen-Altenrhein Airport (ACH) in Switzerland and VIA. Kopf explained he saw a potential 60,000 to 70,000 passengers per year for his airline.