Bulkheads are tricky. Many airlines reserve them for disabled passengers and statusholders in their frequent-flier programs, which makes them more difficult to

Bulkheads are tricky. Many airlines reserve them for disabled passengers and statusholders in their frequent-flier programs, which makes them more difficult to book in advance (I know at least one major airline had a policy of not releasing the coach bulkhead rows until control of the flight transferred to the gate, just to make sure no special-needs passengers would require a bulkhead seat).