RTX's order backlog rose to a record $202 billion, as the aerospace and defense company booked European orders for missiles and air-defense systems, and airlines boosted purchases of spare parts. RTX left its full-year financial guidance unchanged, as it digests the cost of problems with its GTF jetliner engines that have left hundreds of aircraft rounded. Shares of RTX, previously known as Raytheon Technologies, edged lower in early trading to just under $101.