Upvote:2
As stated in Timatic, the database used by check-in staff:
TWOV (Transit Without Visa): - Holders of confirmed onward tickets for a max. transit time of 24 hours
In practice, for TWOV, check-in staff at most airports require the trip to be in a single booking. With separate tickets, Conchin would count as the final destination to them, whereby you will need at least a transit visa.