Originally Posted by
Hyperacusis
EK interlined bags to AA on a separate ticket for me once before, but there's no guarantee that they will. In fact they may require that you have an Indian visa to issue you your boarding pass, since you have separate tickets. I would go ahead and get a transit visa, and if you get lucky, you won't need to use it.
You should be fine interlining through DEL to SQ. As for the visa you won't be needing it as you hold a confirmed ticket within 24 hours of arrival into DEL.
The only issue you might have at check in is the baggage allowance mismatches between the EK and SQ tickets. If the latter is less and you're exceeding this limit then they might only check it through to DEL. The transfer desk should be of help here. Even if you don't hold a transit visa.