IAG stunned industry executives at the Paris Airshow in June by signing a letter of intent to buy 200 737 MAX jets, with a plan for deliveries between 2023 and 2027.

"We are having very constructive discussions with Boeing. We are looking at bringing forward the delivery to 2022, which we think will be possible," Chief Executive Willie Walsh told journalists in a conference call.

The timetable for regulatory approval for flights has slipped in recent months, with Boeing Chief Executive Dennis Muilenburg last week saying he was confident the MAX would be back in service as early as October.

"We remain confident that the issues will be addressed by the safety regulators," Walsh said.

(Reporting by Conor Humphries; Editing by Jan Harvey)