Two Iranian airlines made prospective deals with Airbus on Thursday to buy 73 jetliners, a signal that the global aerospace industry is betting such sales to Iran will prevail despite increased hostility by the Trump administration.

The prospective deals, described by Airbus as memorandums of understanding, are worth as much as $2.5 billion and were announced by the company at the Paris Air Show, an important sales event for plane manufacturers.

If completed, the deals would further solidify Iran as a significant customer in the industry, dominated by Boeing in the United States and Airbus in Europe. Desperate to rejuvenate an aging civilian fleet hurt by years of sanctions, Iranian air carriers have made arrangements over the past year to buy up to 140 planes from Boeing and 100 from Airbus.

The deals are permitted under the 2015 nuclear agreement Iran reached with six major powers, which relaxed sanctions in return for Iran’s verifiable pledges of peaceful nuclear work. But the deals — even for the Airbuses — still must be licensed by the United States government because many components and technology in the aircraft are made in the United States and are subject to export control regulations.