A Chinese mainland spokesperson said on Sunday that a newly activated route W121, which connects to M503 route, will benefit people on both sides of the Taiwan Straits.

The move was designed to ease air traffic congestion, enhance aviation safety and reduce flight delays, said Chen Binhua, a spokesperson for the Taiwan Affairs Office of the State Council, in response to a media query.

The Civil Aviation Administration of China (CAAC) announced the adjustment on Sunday.

Chen emphasized that the M503 route lies within the Shanghai flight information region, and its opening and operation are normal work in the mainland's civil aviation airspace management.

"Previous changes to the route have improved the operation of cross-Straits flights and further facilitated personnel exchanges across the Taiwan Straits," the spokesperson said.