Why can't Donghai Airlines check in online?

The reason why Donghai Airlines can't check in online;

1. Online check-in is not allowed for grounded flights, because the grounded flights may have other events, so they can only check in at the counter.

2. It may be the cause of network failure.

3, or more than 24 hours, online check-in within 24 hours.

4. According to the prompt and actual operation of China Eastern Airlines official website, passengers of China Eastern Airlines (except China United Airlines) can log in to the online check-in column of China Eastern Airlines official website within 24 hours before the flight takes off. 24 hours before the plane takes off. Online check-in only supports tickets of China Eastern Airlines, and the actual carrier also handles the counting of tickets of China Eastern Airlines.