Thank you for your feedback. However, the power in Logbook Pro is that you don't need these extraneous columns in a PC logbook. Configure your A/C Types in the Options...Aircraft area then there is no need to have an additional ASEL column in the logbook data entry area. When you make a flight log entry that is of a type C-172 and a duration value, that's all Logbook Pro needs. It will reference the C-172 in the Options...Aircraft area and apply the duration to automatically calculate the Category, Class, etc. information. This eliminates redundant data entry and minimizes the opportunity for error.