We hold US passports and have planned two flight iteneraries. Firstly, we're flying with CX from DPS to HKG, then to TFU (on same itinerary with a 2-day stopover in HKG). After spending 5 days in Chengdu, we'll be flying with Thai Airways from TFU to BKK. We're aware that this journey complies with the 144-hour Transit Without Visa (TWOV) policy. However, we are concerned that the check-in staff at DPS might not be familiar with the TWOV policy and could potentially refuse us boarding. Additionally, online policies (from United, Skyteam) still list CTU as the airport in Chengdu, despite all international flights now departing from TFU instead of CTU. This discrepancy might further confuse the check-in staff.

Has anyone had experience with TWOV procedures at DPS airport? Is there a risk of encountering issues while obtaining a boarding pass there? Is it possible for the DPS staff to issue the boarding pass for the first leg to HKG, and for the HKG staff to issue the pass to TFU? (We assume the staff at HKG might be more knowledgeable about TWOV).

Thanks in advance!