Market ends flat amid choppy trades: Markets ended flat on the first trading day of 2015, amid lack of investor participation, with index heavyweights leading the decline. The Sensex ended up 8 points at 27507.5 and the Nifty was up 1.30 points at 8284. The market breadth indicating the overall health of the market was positive. Airline stocks jumped after PSU OMCs reduced aviation turbine fuel price for sixth succeeding month. In the foreign exchange market, the rupee edged lower against the dollar due to buying of American currency by banks and importers.