American Airlines has instated new weight limits on wheelchairs on many of its flights. Some planes allow 300 lbs wheelchairs, while others allow 400 lbs wheelchairs. John Morris, who uses a 450 lbs power wheelchair, has been unable to fly some of his normal routes due to the new rule.
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UPDATE: Policy has already been reversed. https://www.npr.org/2020/11/23/938063066/american-airlines-reverses-policy-that-imposed-weight-limit-on-wheelchairs?fbclid=IwAR3QHVZK2MukNX1GBwf_28ah2lOKH_s7GQSEtnN7q8AAlNm1U5JSgvq7nPc