Surely this has happened to you. You were very eager to fly, and when you taxi out a loooooong line of planes to get out of La Aurora fighting with the commercial airplanes getting in. This gets much worse when morning fog closes the airport. Then you can almost certainly expect long waiting times.
Its hard to predict human behavior like pilots like you and me. Surely Guatemala weather is usually more favorable in the mornings. But I did look at some hard data of commercial airlines. These are scheduled and I pulled the data for free from http://www.flightstats.com. A little bit of data manipulation and here it goes…
The left-hand side of the graph shows average arrival and departure times. Also the overall activity which is simply the sum of the two. Same information but this time for the week-end is on the right side.
For the early morning guys, based on this you need to get out before or at 6:00 in the morning. The first peak of mostly departures happens between 06:00 and 07:00. Throughout the week this stays more or less high until about noon then drops down a little. So afternoon flying throughout the week looks promising. There is a little peak about 7:00 but then the day winds down.
On week-ends, you can get out very early or wait since between 7:00 and 9:00 scheduled activity drops again. In turn you have the peak around lunch with both incoming and outgoing commercial aircrafts.
Ok. I will admit it, not the huge discovery, but interesting nonetheless.