It’s not a question of skill—the FO is fully capable of performing RTOs. However, the rejected takeoff is a rare, extreme case where removing any uncertainty, ambiguity, or decision-sharing is paramount. This is reflected in both safety reports and industry best practices.
The Captain is the designated pilot-in-command, legally and operationally responsible for the safety of the flight. During a high-risk event like a rejected takeoff—where milliseconds count and consequences can be catastrophic—the decision must rest with the individual who bears this overarching liability and authority
Takeoff is the most critical phase of flight, with few opportunities for error. Assigning the RTO decision and maneuver to the Captain eliminates ambiguity and delays caused by cross-cockpit communication—there’s no time to debate or cross-check during a high-speed abort scenario. This streamlines response, ensuring one person acts without hesitation.
High-pressure decisions with life-or-death implications require clear lines of authority.