Apparently this is a newer bug that I was not aware. It was introduced somewhere in the current V8, thus there are many V7 and earlier versions that could be working without this bug. This is already fixed in the V9 that is coming out soon.
Currently, the bug is deleting the most recent flight and limiting to 70 flights. It should be removing the oldest flights, and there lies the bug. The 70 flight limitation is also a new behavior in V8 that I was not aware of. Might have been Brian or Walter that posted that. Sorry or the confusion.
We are addressing that behavior and will not truncate to the 70 flights anymore. We are also looking at prompting a message to remove older flights, in the event the card does become full. Most likely caused by additional features, user files like music, movies, PDF, etc. I hope this helps.