Twice a year, at the end of the Painkuni and Alpassi festivals, the images of Padmanabhaswamy, Narasimha and Krishna are carried from the temple to the sea at Shanghumugham, across the runway of Thiruvananthapuram's international airport, which closes for the evening.
On the last evening of each festival the three images, Padmanabha, Narasimha and Krishna, are carried out of the west fort gate on Garuda mounts. At their head walks the senior man of the Travancore family in a green silk cap with the ceremonial sword. Within the hour the procession is inside the airport compound; it rests at a mandapam built for it there and then walks along the runway, about two kilometres of it, with caparisoned elephants, percussion and armed police. The airport, which has one runway, has issued a notice to airmen weeks before, and every flight waits. At Shanghumugham the images go into the sea. They return the same way by torchlight, and once they are gone the tarmac is swept, inspected and opened, at about nine at night. The Travancore kings built the airport in 1932 across the old route, and the route stayed.
Sources: Flight operations in Kerala capital halted to facilitate Painkuni Arat procession (The Hindu, 2 April 2026); Kerala airport halts flights for 5 hours as holy procession crosses runway (NDTV); Thiruvananthapuram: the Indian airport that halts flights for a divine procession (BBC)