Why were 67 flights cancelled, 1,470 delayed across Asia on April 13?

Around 67 flights were cancelled and about 1,470 delayed across major Asian airports, including those in India, Indonesia, Thailand, Japan, UAE, and Singapore on Monday. Disruptions were caused by high air traffic, airspace restrictions linked to West Asia war, and operational challenges from longer routes and high fuel costs. In India, Delhi, Mumbai, and Bengaluru airports were notably affected.