Air India's market share dwindled last month pushing it down to the fourth position among domestic carriers as it registered the highest flight cancellations despite having no labour trouble then. King-fisher Airline's market share also dropped to the last spot, according to the April air traffic data released by the Direct-orate General of Civil Aviation. The data showed Jet Airways and its subsidiary JetLite joint-ly cornered 28.2 per cent, follo-wed by IndiGo with 23.8 per cent and SpiceJet at 17.7 per cent.