Nok Mini Airlines (ex-SGA Airlines) is owned by Siam General Aviation Co., Ltd., based in Bangkok. Its president is Jain Charnnarong. It started operations in October 2002. The company also is an authorized service center for Cessna aircraft in Thailand. In November 2004, it launched daily Bangkok-Hua Hin flights.
The company started accepting Internet bookings in 2005, and in 2006 it received an Airline Operation Certificate and commenced flight operation as a scheduled airline. In February 2007, it started services from a second hub at Chiang Mai International Airport (ex-primary hub), servicing routes to Pai and Nan. In addition to its own website, the company accepts bookings through Nok Air's website, and operates routes for that airline, which is a low-cost subsidiary of Thai Airways International.
In 2010, the airline operated two 33-seated Saab 340 aircraft leased by Regional Express Airlines in Australia painted in the colourfull Nok Mini livery. These aircraft were delivered on January 5, 2010. Registrations are HS-GBA (blue aircraft) and HS-GBB (green aircraft). Both aircraft were transferred to Happy Air and had their titles removed but retained their colorful paint scheme. They were reregistered to HS-HPE and HPI in July 2010. But Nok Mini added two more 3rd generation Saab 340B's in 34 seat configuration early in 2011 in eye-catching purple (HS-GBC) and pink colour schemes (HS-GBD). In October 2011, 3rd gen Saab 340B in bright red/orange colour scheme but no eye lashes (HS-GBE) was delivered to Nok Mini's fleet and also in May 2012, Saab340B in same colour scheme of Nok Air B738 (HS-GBF) has been added to its fleet along with its twin, HS-GBG which is in the same colours as HS-GBF. This is a purple and white paint scheme. In early 2013 probably the most eye catching of the lot was added, HS-GBH finished in blue with light aqua colour scheme. HS-GBC and GBD which previously had the standard wingspan have been fitted with Extended Wingtips.
In July 2011, Nok Mini Airlines moved its base to Bangkok : Don Mueang International airport.
Saab 340B - (HS-GBA and HS-GBB) were leased out. Both aircraft returned to Australia in November 2011 and were registered as VH-ZXS and VH-ZJS. Both are still in the basic NOK mini livery but the nose cones were painted white.