Ctrip e-tickets can be refunded according to airline regulations when they are not used and are not printed for travel to travel itinerary. If you have printed a business trip to travel itinerary, you must process it through a business trip to travel itinerary.
Tickets under 30% discount will not be changed or refunded in principle. Charge 50%-20% discount as required. Full-price tickets or first-class tickets can be changed at will, as long as there are more tickets on the changed flight. If you are not sure when to change your ticket, you can always keep it. If the ticket is higher than the current price, you have to make up the difference, and the airline holding the ticket is not allowed to make up the difference. If it is because of the airline that needs to be changed, there is no restriction. In addition, some airlines also have corresponding regulations on changing their visas two hours before and after takeoff.