What you want to ask is whether it is illegal for teachers to go out for training and fly? There is no violation.

In principle, teachers are not allowed to fly when they go out to study. However, due to the urgency of the task or the fact that the air ticket price on that day is not higher than that of other vehicles that meet the requirements, it is necessary to indicate when filling out the Approval Form for School Teacher Training and Learning Funds, and the expenses shall be reviewed by the General Affairs Section and reported to the Vice President of General Affairs or the principal for approval before purchasing air tickets.