Not sure if this is the right forum to post, but figured the folks here might have the best info on this. Have some relatives who commute about twice a year between Vancouver (YYR) & MAA/ BLR. Figured it would help if they stuck to one carrier and thereby consolidated their miles.

Primarily, they’d probably look at the increased baggage allowance as a result. They travel Economy for the most part and look out for the cheapest tickets. Any suggestions on which would be the best program for them to join.

Cathay Pacific & Lufthansa are the carriers they currently use (not enrolled into their programs as yet).

Any suggestions folks?