As of June 2011, Drukair is the only airline that serves Paro. So all visitors to Bhutan are initiated into the kingdom in her care.
The flight into Paro is one of the most spectacular in the world. Whether flying along the Himalayan range from Kathmandu or over the foothills from Calcutta or Dhaka, each flight is a mesmerising aeronautical feat and offers an exciting descent into the Kingdom of Bhutan.

Airbus 319

Airbus delivered both A319 to Drukair in December 2004. Both Airbus A319 start operation in January 2005 allowing Drukair to fly to Bangkok on a daily basis.

Both Airbus A319 has a 114 seats configuration with 20 business class seats and 94 economy seats. 

Manufacturer: Airbus, an EADS Company
Airbus A319 official website

ATR 42-500

The ATR 42-500 begin operation with Drukair in June 2011. It will fly to the nearby cities of Kolkata, Kathmandu, Guwahati, Gaya and Bagdogra.
. It is a 48 economy seater but can be also converted into 8 VIP seat and 22 economy seat, available for charter.

Manufacturer: Aerei da Trasporto Regionale
ATR 42-500 official website