Chavalit Punthong, PTT’s executive vice-president for retail marketing, said the engineers were travelling to Laos to carry out a mission to expand petrol stations and depots.
They were identified as Yangyong Apaanan, Nipol Mengsee and Laos national Vilathep Vivavong.
Chavalit said the deaths were a great loss, adding that PTT would take good care of the families and even pay more than required.
It will also assign a related agency to coordinate with the families to seek compensation from the airline, Chavalit said.