According to the listing of the different airline forums, SpiceJet belongs in Asian Budget Airlines. Under that title it lists (albeit spelled incorrectly - attention SanDiego1K!)
"Air Asia (group), Cebu Pacific, Citilink, Eastar Jet, Firefly, GoAir, Golden Myanmar, IndiGo, Jeju Air, JetLite, Jin Air, Juneyao, Lion Air, Malindo, Nok Air, Orient Thai, Peach, Pegasus, Scoot, Skymark, SpcieJet, Spring, Tigerair (group), T’Way, Vietjet."
That said, I know from doing a search that a good majority of discussions with "SpiceJet" in the title are in India-based Airlines right now. Question is, which is the better locale for them?