Simple Adobe Air Desktop App

Need Adobe Air app that alerts a user it is time to leave and take their train. In advance, the user will specify to the application which train route they take, what time they leave for the train, and the station they board the train. - The application waits until the specified time of day (e.g., 5:00PM). - Then, the application checks a specific webpage ([login to view URL]) every 3 minutes to see if the user's trains on their train line are running on-time. - The application shows a window on the desktop that shows the next train to leave, and how many minutes/seconds until the train leaves (based on the actual train departure time, including any delays). - When the time left is 0:00, the application makes an alert sound. Then it starts showing the next train on that train line to depart.