I have a KE flight YYZ-ICN next month which at time of booking showed a 11:50pm departure. But checking my updated itinerary it now shows the flight leaving YYZ at 1:30am and arriving ICN at 4:00am.

I recalled there was some discussion that commercial flights are almost off limits to land/takeoff between Midnight-6:00am and those time slots were reserved for Cargo? Did YYZ recently lifted its night curfew or did they somewhat relaxed it? Or are airlines now allowed beyond the curfew as long as they are willing to pay a hefty fee for it?

Anyhow, I'm thrilled with the push back of the departure time as a 4:00 am arrival is more civilized than a 2am arrival.