Comment by neurotech1

They took off from an adjacent prepared road that used to be a runway.

> Following an on-site engine replacement, the jetliner took off from Saturn

> Boulevard, a road which had previously been an aircraft runway at Michoud.

> The aircraft was subsequently repaired and returned to service until it finally

> retired in 2016.

From the linked Wikipedia page, which explains why the takeoff wasn't as wild as it first seemed.