American Airlines has announced they are planning to bring back the 737 MAX into service on January 16, 2020 per FAA approval. As a result, American Airlines flights will be adding up to 90 daily flight back into the schedule once all 737 Max return to service. See How American Airlines Plans to Show Its 737 MAX Jet Is Safe

Per American Airlines,

American Airlines anticipates that the impending software updates to the Boeing 737 MAX will lead to recertification of the aircraft later this year and resumption of commercial service in January 2020. We are in continuous contact with the Federal Aviation Administration (FAA) and Department of Transportation (DOT).

Details: 

• Customers booked on a MAX through Jan. 6: All customers who were booked previously on a MAX will be automatically accommodated on the same flights operated by a 737-800 with the same seat configuration. No additional rebooking will be required.
• Customers booked on a MAX from Jan. 7 through Jan. 15: The majority of these customers will be accommodated on the same flight operated by a different aircraft type, which may include a 737-800 or an Airbus aircraft. Beginning Oct. 13, American’s Reservations and Sales team will contact affected customers who are impacted by any potential flight cancellations. Customers who booked through a travel agent will be contacted by their agency directly.
• Beginning Jan. 16: American expects to slowly phase in the MAX for commercial service and will increase flying on the aircraft throughout the month and into February.