Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.601 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
Are all flights going to be on a single ticket? Or will there be separate tickets? Have you called SQ to ask what is the "minimum connecting time" in DEL from SQ to an AI domestic flight?
If you are on separate tickets, you might not be "protected" by either carrier in the event that the SQ flight is late.