It's not the first time that I see this. At the beginning of a question, when I usually would expect to see an «à», I see an «a». Is this correct? In which situations am I allowed to this replacement?
In the age of typewriters, accents on capital letters couldn't be typed, so traditionally they were left off. Now they are optional, though many French speakers - and the Académie française - recommend using them.
On veille donc, en bonne typographie, à utiliser systématiquement les capitales accentuées, y compris la préposition À