(N)Агаарын тээврийн салбарт хэрэглэгчийн үнэнч байдлыг нөлөөлөх хүчин зүйлсийн судалгаа
have a chance to upgrade
not always have a trip
obtain free tickets
enjoy discount
not much different from the one who hasn't joined
not many benefits
low discount percentage
obtain free tickets
have gifts
have a chance to upgrade