Generally speaking, flights are delayed because of the weather. What will be said on the airline's broadcast?

I can tell you that I made up the location and flight number.

Flight delay announcement: Passengers to Beijing, please note that your flight CT3 169 can't take off on time due to air route weather, air traffic control and aircraft failure, and the plot take-off time is to be determined. We apologize here.

Flight cancellation: Passengers going to Beijing, please note that today's flight CT3 169 was cancelled due to (airline weather, air traffic control, aircraft failure), and we apologize here.

Flight delays are generally caused by bad weather on the route, air traffic congestion caused by air traffic control, and the inability of the plane to take off. If the bad situation escalates, the flight will be cancelled.