List of seats with moveable armrests by aircraft Type: https://www.united.com/ual/en/us/fly/travel/special-needs/disabilities/ua-accessibility.html
Chart with cargo hold opening measurements for each plane in the fleet: https://www.united.com/ual/en/us/fly/travel/special-needs.html#disabilities; "Will my wheelchair fit on the plane?" calculator: https://www.united.com/en/US/fly/travel/accessibility-and-assistance/wheelchair-assistance.html; Wheelchair information form: https://www.united.com/ual/en/us/fly/travel/accessibility-and-assistance/wheelchair-form.html
Our wide-body 767, 777, and 787 aircraft are equipped with an onboard wheelchair-accessible lavatory. The lavatories on our single-aisle 737-700, 737-800, 737-900, 757-200, 757-300, Airbus 319, and Airbus 320 aircraft are equipped with a privacy curtain and handrails.
Accessibility Desk: 1-313-234-6992 (charges may apply) or 1-800-228-2744 within the U.S