Considering the premise 'Just before 8:14, it had climbed to 26,000 feet, not quite its initial assigned cruising altitude of 29,000 feet.', is 'It reached its initial assigned cruising altitude several minutes past 8:14.' a statement that stands on its own?
Just before 8:14, it had climbed to 26,000 feet, not quite its initial assigned cruising altitude of 29,000 feet.###It reached its initial assigned cruising altitude several minutes past 8:14.