Customs issued the notice for an estimated Rs 150 crore Global 5000 Bombarider plane belonging to the Reliance Transport and Travels Pvt Ltd for over Rs 37 crore as duty.

Till now, the authorities have seized about 10 aircraft obtained by corporate entities, including a Mukesh Ambani group firm, GMR, Oberoi and Indiabulls under non-scheduled operator permit, but released the same on bank guarantee and bonds.

ADA group firm Reliance Transport and Travels said immediately that though it had done no wrong, it offered a voluntary bank guarantee and indemnity bond, a move spurned by the customs on the ground that without issuance of seizure notice no such offer can be accepted.

Customs department is scrutinising over 250 corporate jets, including those belonging to Tatars, DLF and Raymonds, amid reports that different regional custom offices are issuing notices to them one by one.

A spokesperson of Reliance Transport and Travels said that "RTT is a valid NSO permit holder and has responded and furnished full and comprehensive documentation regarding its aircraft.