The reason I listed aircraft types were so your cousin could know the various big, small new, old ones he can choose from.
Kam Air also have 767s which fly to Dubai unless they have been phased out, the Ariana A300's are ex-Air India.
From Peshawar and Islamabad two other Pakistani carriers Shaheen Air and Aero Asia also fly to Dubai, offering much cheaper fares, Shaheen uses 737-200, Aero Asia use the same as well and the DC-9/MD-83.