Senator Imee Marcos questioned the presence of yet more C-17 Globemasters of the US Air Force in Manila and Palawan.

Marcos's query comes a day after the Senate Committee on Foreign Relations, which she chairs, released a statement on a similar military plane that landed in Manila last week but which US flight planners failed to coordinate beforehand with ground handlers at Manila's international airport.

Global flight tracker AirNav Systems revealed that at 6:03 a.m. on Friday, a US Air Force C-17 with flight code MC244 / RCH244 landed in Manila after leaving the Andersen Air Force Base in Guam, then flew to Palawan before 1 pm and headed for Yokota Air Base in the city of Fussa, Japan later in the afternoon.

Although the plane's call signal was repeatedly out of coverage during its journey, flight tracker Flightradar24 recorded its departure from Palawan shortly before 4 pm, Manila time, and its arrival at Yokota Air Base at around 9:30 pm, Japan time.

The flight route from Palawan showed the plane passing over Pampanga, Cagayan, and off the eastern coasts of Batanes and Taiwan before it landed at the Yokota Air Base.

Passengers on commercial flights to and from Manila's international airport noticed two U.S. military planes near the runway and shared pictures with Marcos's office.

On Saturday, a C-17 that took off from Tokyo the night before with flight code RCH323 was spotted north of Busuanga past 10 am and was off the radar until late afternoon when it again appeared in the same vicinity flying toward Polillo Island before exiting the Philippine territory past 6 pm.

"Too little is known about ongoing US military activity in our territory while we constantly call out the presence of Chinese vessels in the South China Sea," the senator noted.

"I am aware of ongoing exercises with foreign militaries this month. But the same zeal in tracking any violations in our maritime territory and EEZ (exclusive economic zone) must also apply where Philippine air traffic rules and joint military agreements with the US are concerned," she added.

Marcos also called on Philippine military, defense, and foreign affairs officials to determine if covert US military flights aggravated the already tense situation in the South China Sea and Taiwan Strait and to weigh the risks to public safety. Senate of the Philippines