The order allows broader purchases of the fuel and directs officials to defer federal excise taxes on its on-road use through the end of the year.
The GCAA said the probe is being conducted confidentially and in coordination with regional and international authorities.
The investigation falls under UAE jurisdiction as the aircraft is UAE-registered.
The withdrawal, agreed under President Joe Biden and implemented by Donald Trump’s administration, has been welcomed by Iran and its allied groups as a victory.
The deal covers agricultural products, cosmetics, toys and small appliances. Both sides will also establish a trade council and continue earlier trade agreements.
Trump highlighted progress in US-China trade ties, while Xi stressed that the two countries should pursue healthy competition and ensure fair treatment for their companies.
Washington previously sanctioned Zanjani and other companies linked to his digital-asset and business operations.
A 1998 peace agreement ended decades of violence between Irish nationalists seeking unity and unionists who wanted Northern Ireland to remain part of the UK.
This time, however, New Delhi succeeded in keeping the negotiating process alive until consensus could be reached.
The declaration itself offers a map of possible cooperation rather than a blueprint for confrontation