When looking at the available slots for an airport the numbers kind of confuse me. For example, at my base at Dallas - Fort Worth, the capacity is 58 departures per hour. When I look at the slots chart, I see numbers, obviously 58 or below 58 if some slots are taken in a certain hour.
This part confuses me though: When you click on a certain time period, like 5:00 - 6:00, you get the average slots per five minutes, which are 4.83 or something. How come I have been able to get about 20 departures at exactly 5:00 when it only shows 4.83 (before any slots are taken).