public void AddingOneDayReturnsAprilEighth()
        {
            var date    = DateTime.Parse("2018-04-07T00:00:00");
            var compare = DateTime.Parse("2018-04-08T00:00:00");
            var actual  = AircraftService.FindNextHoursDue(date, 1);

            Assert.Equal(actual, compare);
        }