According to orders passed by the Kuala Lumpur High Court on Thursday seen by Reuters, plaintiff of case is Peregrine Aviation Charlie Limited and matter pertains to two jets leased to PIA by Dublin-based AerCap, the world’s largest aircraft lessor, in 2015 .(Nawaz Sharif Govt)

They are part of a portfolio that AerCap sold to Peregrine Aviation Co Ltd, an investment unit of NCB Capital, the brokerage arm of National Commercial Bank SJSC, in 2018. (Shahid Khaqan PMLN govt.)

Impounded Plane,was acquired by PMLN Government in 2015 on Lease
PIA failed to pay the lease & Plane was deemed "Stolen Property" yet Nawaz Sharif Government kept on using this Plane for next three years.
In 2018,Plane was handed over to PTI govt. by then PM Shahid Khaqan Abbassi

The impounded Plane (sources) is flight PK894 . The Plane registration Number is AP-BMH (Boeing 777).
This Plane was acquired under lease in 2015.
It is operational Since 2016 (PMLN government)

The manufacturer & Lessor details are shown in document below;