Saudia B747-300 (Chennai to Jeddah/Riyadh/Dhammam)
Gulf Air A330, B767 (Chennai to Doha/Bahrain/Muscat)
Emirates A330, B777 (Chennai to Dubai)
Oman Air B737 (Chennai to Muscat)
Singapore Airlines B777, B747-400 (Chennai to Singapore)
Malaysia A330 (Chennai to Kuala Lumpur)
Thai A330 (Bangkok-Chennai-Dubai-Chennai-Bangkok)
***
Indian A320, A300 (Chennai to Bahrain/Kuwait/Doha/Muscat/Dubai/Ras-Al-Khaimah/Fujairah/Sharjah; Singapore; Kuala Lumpur; Bangkok; Colombo)
Air India A310 (Chennai to Bahrain/Kuwait/Muscat/Doha/Dhammam/Jeddah/Riyadh/Abu Dhabi/Al Ain/Dubai; Singapore; Kuala Lumpur; Jakarta)
Air India Express B737-800 (Chennai to Kuala Lumpur; Singapore)
*
Jet Airways B737 (Chennai to Singapore; Kuala Lumpur; Colombo)
Air Sahara B737 (uncertain -- used to have a service Chennai to Colombo)
(Air India has surrendered the market to the West to the European carriers, Emirates and Sri Lankan. Flights, by AI, to the West from Chennai are ex-Mumbai).
Air Nepal b757 oman air b737-800 gulfair a320/b767 egypt air a330 BA b777 (aftrnoon flite) b747 (latenite flite) South african a342 Delta b767 (will change to a b777 frm nov fr a bom-jfk non-stop) cathay cargo b742F (seen the silver bullet few times) ocean airlines b742F yemenia a330 alitalia b767 alitalia cargo md-11F jordanian a310
will post if i remember anymore (these are the ones i have seen including some mentioned above)