It built a special Songkran fountain to lure visitors to Bangkok, which is traditionally deserted for the festival as migrant workers return to the countryside to visit relatives.
Also, if you are combining an e-ticketed flight on Carrier A with a traditionally ticketed flight on Carrier B, on the return leg, you must present the voucher to Carrier B to prove that you have a valid booking on Carrier A to fly out of your next stop.