Well I started my travelling got a flight from BKK to Udon Thani,advertised at 930 baht but I forgot they add VAT etc which altogether was 1930 baht?

Anyway I got a bus from Udon Thani to Khon Kaen and loved KK,got a bus to this place which is called Loei which is not really a place I like.

My question is,if I go to Loi airport what airlines are,as i noticed AA and Nok not flying Loi.

Also does this place Loei have a Thrifty or Hettz rent a car?

Nok was the only airline servicing Loei and they no longer fly there. I doubt you can rent a car there if you are going to return it somewhere else. The hotel, Loei Palace used to rent cars so you could check with them.

Loei is just a laid back small city with VERY few farang oriented things. You won't even find a super store there. You would probably be ahead to just go to the bus station when you are ready to move on.