I think that Delhi is only D Class now on CX. You can do F HKG-NRT, but may have to include a stop in TPE. CX is cutting a lot of F from its' regional routes. A post/look at the CX forum may give a little more help. My last AONE needed some adjustment and I had to fly D SIN-HKG AND HKG-NRT to fit my schedule after CX dropped F on the services that I wanted (booked) to use.