Originally Posted by
Trip7
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.
This is why the CA is designated to decide and execute. The ultimate responsibility dictates the CA be the one executing an abort. If the FO does it and messes it up the fault still lies with the CA. This is also why CAs are encouraged to land single engine. The reason we have a highspeed regime is to simplify the decision and speed the execution of an abort. Anything distracting from this adds additional risk unnecessarily. It's not about the FOs experience or ability but about a methodical approach to eliminating risk.
As PIC the option always exists to take control of the airplane. CFIs who train new students are good at identifying and intervening because they have a much wider SA and are trained to react when the aircraft (by malfunction or pilot action) is not performing as anticipated. The transfer of controls should be a non-issue. The only thing that has made it an issue is automated RTOs. The captain has to decide if the spoilers are up and the brakes are working. I actually default to manual brakes and grab for the spoilers more than DAL would like because that's the way my primary training was in a non-autobrake and spoiler airplane. A hesitation after saying "abort I have the airplane" doesn't mean incapacitation. It is likely tracking center line or being corrected to it and if the systems are working the airplane is slowing itself when thrust is idle and then emergency reverse. It is difficult to stay off the brakes and allow the spoilers to deploy automatically.