Thanks for your help.
I'll be flying coach.
Yes, MR points to Avios and booking on a partner like AA from JFK to LHR and then BA to DEL because the taxes are cheaper.
I do have have AA points I can use, but I'm flush with MR right now and I'm trying to figure if I can utilize the 50% bonus other than short haul US flights
None of the flights I was considering had a stopover.