TFRs come from the FAA's own TFR site, tfr.faa.gov. I have set up a scheduled job to get it. It runs every 4-7 hours.
Planned TFRs like the fleet week are handled like this. Short notice TFRs are a weak spot if one lands after the last job. For commercial applications, the schedule would need checks at shorter intervals.
Stadiums are different. There is a standing FAA rule ( mentioned in the post). So each time a route crosses Oracle Park, a check is made to see if a game is present on that particular day and its starting time. Since we do not know when the match will end, we have made the assumption of 3.5 hours from the first pitch/start.
Planned TFRs like the fleet week are handled like this. Short notice TFRs are a weak spot if one lands after the last job. For commercial applications, the schedule would need checks at shorter intervals.
Stadiums are different. There is a standing FAA rule ( mentioned in the post). So each time a route crosses Oracle Park, a check is made to see if a game is present on that particular day and its starting time. Since we do not know when the match will end, we have made the assumption of 3.5 hours from the first pitch/start.