I know that airlines frown upon nested ticketing so here is a question for the mor e experienced here.

The cheaper option for me is to:
1. Purchase a JFK-DEL-JFK on Delta (Leave 04/14, Return 05/26)
2. Purchase a DEL-JFK-DEL on Lufthansa (Leave 04/28, Return 05/05)

Since the tickets are on two separate airlines and will be purchased as two separate transactions, will Delta and Lufthansa catch this? If yes, what are the possible repercussions?