In the recent thread "How does altitude affect the aircraft performance", John Tullamarine posted the link below to a Boeing article on AOA. An excellent read, BTW, many thanks
http://http://www.boeing.com/commercial/aeromagazine/aero_12/attack_story.html#figure1
One of the figures, figure 2, shows that if speed brakes are extended, the stalling aoa is actually GREATER than that without speed brakes deployed, shown here
http://http://www.boeing.com/commercial/aeromagazine/aero_12/attack_fig2.html
The text says "Wing-mounted speed brakes or spoilers have the opposite effect. They reduce the lift at a given AOA; they also reduce the maximum lift achievable but, surprisingly, increase the AOA at which stall occurs."
Anyone able to provide an explanation of why a wing stalls at a higher angle of attach with speed brakes deployed?