Ordinary calculators only work on decimals and it is always tricky to sum up lots of log-entries correctly. Simply enter the flight hours-minutes line by line and the calculator adds them. * Edit single flight time line. * Erase single flight time line. * ADD - SUBSTRACT flight times * Slide your finger over the time to delete digit by digit. * Enter your departure and arrival time (ZULU) to calculate your flight time. Available for Iphone / Ipad