does anyone know how many days out can special meals be requested? i'm looking to select a kids meal for my son who is flying with me in J from YYZ - YVR but when i go to the AC website and try and select "Dietary Restrictions" it gives me a note "Unfortunately no meal is available on these flights."

wondering if it only gives me an option at a certain number of days before the flight or this just an AC web glitch.