I was friends with a married couple years ago, that were always late, sometimes by hours, and even by days. Never once were they on time, except for their jobs, where they would get fired for intentional tardiness. The thing is, I don't think they were unable to be on on time because they were just thoughtless. I believe their tardiness was carefully calculated, and projects or distractions were preplanned to insure they would be late. I complained to them, as did their entire family. Sometimes they would giggle about it, sometimes they would act like people were annoying them them.
They offered to take me to the doctor to have stitches removed after an operation. It was 165 miles, but they were taking their visiting parents to the airport, so I had a chance to observe without being affected. I showed up at their house at the time we set to leave, and had a chance to watch their parents start to get nervous, as one thing or another had to be put on hold, or some thing had to be done first. We did get to airport in time for the parents to run from the car and board the plane as the doors to the gate were closing. They were nervous wrecks. This was before all that homeland security had to be put in place.
Honestly, I never figured out why they did this (ALWAYS did this, not just now and then). I could only speculate, and when we did discuss it once, they just became vague. They offered no explanation, and didn't even tell me to go **** myself. I think they liked being mysterious about it, but I'm only guessing.