Recently I got the new information that Jetstar Pacific and VietJet Air sent to the ticket offices and agents. Specifically as shown below her attached below. For VietJet Air, if the flight is delayed from 15 minutes to 1 hour, the airline will not text and call the ticket buyer or agent who has booked tickets for guests. If there is a message from 1 hour to less than 3 hours, there will be a message but no call. Only flights that are delayed for more than 3 hours will be notified by VietJet Air via all channels, email, text and phone calls.
Likewise is Jetstar Pacific, but slightly changed. If the flight is less than 40 minutes late, you will only receive notification mail. From 40 to less than 2 hours to get a message, and from 2 hours or more to be notified via text and phone, besides email. You should pay attention to this information so that you do not be passive when traveling or traveling.