🚩Is the fast-track ticketing queue at Da Nang Airport departure a matter of luck?

Somehow, this month I ended up visiting Vietnam again after just 2 weeks. As always, Da Nang Airport has a lot of night flights departing for Korea, so standing in the check-in line is tough. That's why I always apply for the departure fast track at Da Nang Airport before I go. Every time I go to Da Nang, I make sure to apply for the Da Nang Airport departure fast track, and I've used it a lot. When I arrived at the airport and checked in at the ticketing counter, if there was a long line, the departure fast-track staff would either open a path to the side for me or let me go to the front. If I arrived early and the counter hadn't opened yet, I would stand aside separately, wait for it to open, and once it opened, I'd check in and go through the inspection gate. Of course, it wasn't a business class ticket either. I was always able to check in without ever waiting in the ticketing line. Until now, with the fast track, I got two speed chances — one at the ticketing counter and one at the departure immigration checkpoint. That way I always breezed through immigration in a flash. So I always used to shout "Fast track is the best!!" ~^^ But you know what... Two weeks ago, when departing from Danang Airport, the fast track staff member told me to line up at the ticketing counter. Huh? What line? Why? I was puzzled, thinking "why is this happening? Since Paratha Airlines is a new airline, I thought maybe some agreement hadn't been finalized yet, so I stood in line and got my ticket. I got through immigration right away. But this time, at Da Nang Airport again, they told me to line up again! Again? Line up? It was so strange that I asked the staff why they weren't letting us through, and they said, "Are you in the business line? No? Then you have to stand in line!" That's what they said! TT It's not like I've used the departure fast track only once or twice!! I've flown with various airlines over the years, and because I never stood in the ticketing line, it always felt strange. Maybe it's because it was Paratha Airlines? It was strange, but... I did stand in the ticketing line, and only zipped through the immigration checkpoint quickly without lining up. After coming back to Korea and asking our members about it, of course the immigration checkpoint is passed directly via the fast track, but There were some who stood in line, and others who got in quickly. This year, there have been a few people who sometimes stood in the ticketing line and sometimes didn't. The staff members I used to see often are no longer around, and this month I've only seen a new employee twice. I wondered if it depends on the staff, so I asked through the Talk channel, but they said that's not the case... Up until now, I had been getting through smoothly and luckily, I wonder if we didn't stand in the right ticketing line... This time I noticed that the staff member at Counter B, who used to only hold the name list for our company, now also had name lists from other companies too... If we have to stand in the ticketing line at Da Nang Airport again next time... ㅜㅜ