With 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 'Its initial assigned cruising altitude was 29,000 feet.' a reasonable conclusion?
Just before 8:14, it had climbed to 26,000 feet, not quite its initial assigned cruising altitude of 29,000 feet.###Its initial assigned cruising altitude was 29,000 feet.