The Transport Ministry has urged low cost airlines not to cut air fares too low after tour bus operators complained that they have lost a significant number of customers.   The move came after tour bus operators complained in December 2014 that they were losing customers to low cost airlines and urged the Ministry to do something.    Transport Minister Air Chief Marshall Prajin Juntong told reporters on Friday that the Ministry will ask low-cost airline operators not to reduce airfares so much that it affects other transportation busi