When you set up an alert, we check availability with BA periodically, and send you an email if there are any new dates available.
For Elite members, we check every hour, but for non-Elite members, we'll only run your search once a day.
Until now, all non-Elite alerts have been checked at the same time in the morning every day. This isn't a good long-term approach, as it means that we hammer BA with traffic in one burst, and the process takes longer and longer every day as we add more and searches to run.
Now, non-Elite members' alerts will now be staggered across the day to spread the load, so you could receive alerts at any time, but no more than once per day.