Ummm.. I didn't travel to India (CCU is Kolkotta/Calcutta).. I travelled from CUN to NRT.. This was part of a RTW ticket.. I saw it was 777 from MEX-NRT and thought it was worth a try.. I'd had a good experience on AM a few years back.. And, wouldn't you do almost anything possible to avoid connecting in the US and having to go through the mess of Immigrations and Customs there?