"Individually these issues, while not up to specifications, still meet limit load conditions," Boeing said at the time. "When combined in the same location however, they result in a condition that does not meet limit load requirements."
Prior to the accidents, Boeing spent years essentially giving oversight over its own planes. However, moving forward, the FAA insisted that all Boeing planes have to comply with the agency's specific approved designs.
American was forced to cut five international routes from its summer schedule because of the delay, including Edinburgh, Scotland; Shannon Ireland; Prague, Czech Republic; Dubrovnik, Croatia; and Hong Kong.
The setback also impacted several other carriers, like United Airlines, Lufthansa, Qatar Airways, and Emirates.
American CRO Vasu Rasa sent an internal memo to employees in December, which was shared with Insider, that said 13 Dreamliners were not going to be delivered on time, forcing the carrier to make the cuts.
"We're so disappointed in Boeing right now because they are not delivering the airplanes that they promised they would, and if they did, we would be flying even more to Europe than we are in our current schedule," he said.
The agency said the visit was "to ensure that the FAA is satisfied that Boeing has taken the appropriate steps to improve manufacturing quality and to guarantee the autonomy of workers who ensure regulatory compliance on the company's assembly lines."
However, the FAA said it still insists that federal inspectors need to assess the airworthiness of each aircraft prior to approving final delivery. American's plane passed inspection on Monday, per the WSJ, citing people familiar with the matter.