I often see JFK-AUH using AA miles in business but not JFK-BOM with a stop in AUH. I wouldn’t mind buying a separate revenue ticket on Etihad in coach for AUG-BOM but would Etihad agree to check in my baggage to final destination? It will be 2 separate itinerary numbers obviously and luggage allowance isn’t a big deal as I barely hit 50lb per bag