s/Am optical/An optional https://www.aviationtoday.com/2019/05/06/boeing-angle-of-attack-disagree-alert/ https://www.aviationtoday.com/2019/05/06/boeing-angle-

s/Am optical/An optional https://www.aviationtoday.com/2019/05/06/boeing-angle-of-attack-disagree-alert/ https://www.aviationtoday.com/2019/05/06/boeing-angle-of-att...