SINGAPORE - Singapore Technologies (ST) Aerospace has confirmed that a fine of 60 million Rupiah ($6,300) was paid to Indonesia's Directorate General of Civil Aviation on Wednesday, following an alleged incursion into Indonesian airspace by one of its aircraft.

A company spokesman said their "top priority was to bring our aircraft and crew back to Singapore earliest possible".

The C90GTi King Air plane, owned by ST Aerospace and operated by its pilot training arm, Pacific Flight Services, was intercepted by Indonesian fighter jets on Tuesday while en route from Sibu in Sarawak to Singapore.

The plane, carrying a Singaporean pilot and two foreigners, was forced to land in Pontianak and detained. It only returned to Seletar Airport at 7.18pm on Wednesday.

ST Aerospace said that it had followed protocol and the company had filed the original flight plans as it normally has done for similar flights.

It will "continue to seek clarification with the authorities on the matter, and make necessary changes to the flight plan as required," the spokesman added.