Nok Air joins with the  Zoological Park Organisation to offer its passengers who fly to Chiang Mai free entry to Chiang Mai Zoo. The promotion is valid from September this year through to 31 August next year. To be eligible for free entry (Bt70 for an adult), passengers have to show their boarding pass as well as ID card. This special deal does not include entrance fees for special exhibitions within the zoo such as a visit to the panda enclosure (Bt50 per adult) and aquarium (Bt290 per adult). Also until 16 September, the carrier is selling promotional fares under its Discover Thailand campaign quoting all-in one-way fares at Bt990 to Phitsanulok, Ubon Ratchathani and Udon Thani and between Chiang Mai and Mae Sot. Meanwhile it is offering a Bt1,110 one-way fare for flights from Bangkok to Chiang Mai, Chiang Rai, Nakhon Phanom, Sakon Nakhon, Buri Ram, Hat Yai, Phuket, Nakhon Si Thammarat, Trang, Surat Thani, Phrae, Nan, Chumphon, Chiang Mai-Mae Hong Son, Chiang Mai-Udon Thani and Chiang Mai – Hat Yai routes The travel period is from 11 September to 30 March 2013. From ttrweekly