Your interviewer is seeking an Aircraft Mechanic that can be relied upon to show up for work on time, each and every day. They're asking this question to get your overall philosophy on punctuality and attendance on the job. As you talk about your attendance record, be up front and honest about your vacation days that you used, how much notice you were required to give, and how much notice you gave for each block of time off. Also, talk about any unplanned days you needed off for sickness or other emergencies, and let your interviewer know of the urgency of situations that would keep you away from work. In the end, ensure that your interviewer walks away from the interview confident in your ability to be relied upon for the job.