Airlines on Thursday scrambled to remove Boeing 737 Max 8s and 9s from their routes and rebook passengers after the FAA grounded all Boeing 737 Max aircraft in the wake of an Ethiopian Airlines crash that killed 157 people.

Southwest Airlines said it removed its 34 Max 8 aircraft from scheduled service, noting that the aircraft represents less than 5% of its daily flights. The airline said any customer booked on a canceled Max 8 flight can rebook on alternate flights without any additional fees or fare differences within 14 days of their original date of travel between the original city pairs. 

Southwest said it remained confident in the Max 8 after completing more than 88,000 flight hours and over 41,000 flights, but that it supported the FAA's action. 

United, which operates Boeing 737 Max 9 aircraft on 40 flights per day, said, "We do not anticipate a significant operational impact as a result of this order. We will continue to work with our customers to help minimize any travel disruptions and will proactively contact any customer whose travel may be impacted by this order."

American Airlines, which operates 24 Boeing 737 Max 8s, said it would "work to rebook customers as quickly as possible."

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