Former civil aviation minister and NCP leader Praful Patel on Monday appeared before the ED in connection with a money-laundering probe related to losses suffered by Air India as part of an alleged multi-crore aviation scam, officials said. Patel appeared before the agency around 10:30 am in New Delhi, they said. His statement will be recorded under the Prevention of Money Laundering Act (PMLA) and he is expected to face a series of questions.