Airbus SE agreed with the U.S. to have its global defense business monitored by an external compliance officer—part of a sweeping €3.6 billion ($4 billion) deal with American, U.K. and French prosecutors that settles alleged bribery and export-control violations against the plane maker.

Airbus disclosed the financial terms of the deal—the largest international settlement over alleged bribery ever—earlier this week. Prosecutors and officials in all three jurisdictions, in detailed allegations released Friday, said the company made illicit payments for years to intermediaries to secure contracts for its planes and other products.

In one example, British prosecutors said Airbus paid $50 million between October 2013 and January 2015 to sponsor a sports team jointly owned by two AirAsia executives in Malaysia. Airbus allegedly made the payment to secure an order for 180 aircraft.

AirAsia denied any wrongdoing: “AirAsia never made purchase decisions that were premised on an Airbus sponsorship,” it said in a statement.

In some cases, communications related to payments were allegedly disguised using fake names and coded emails. British prosecutors say payments in one instance were referred to as “medications and dosages prescribed by Dr. Brown”—Dr. Brown being an alias for an Airbus executive and the dosages referencing invoices. In the same deal, at a different time, a senior airline executive was referred to as Van Gogh and details of the deal were referenced as his “paintings,” the prosecutors said.