Two companies are promoting new child seat-restraint systems for in-flight use.

AmSafe Aviation of Phoenix's system employs an adjustable harness designed to fit any aircraft seat and is appropriate for children weighing 22 to 44 pounds (ages about 2 to 4). According to inventor Louise Stoll, it sells for about $75 through
www.kidsflysafe.com.

UK-based Mann Aviation Group Engineering of Surrey, meanwhile, is offering a padded-seat-and-harness restraint system that attaches using the standard aircraft seatbelt. It weighs less than six pounds and is designed for both forward and aft-facing positions and for children from infancy through 44 pounds. For additional information, contact Mann Aviation's interior division at +44 1 276 857 888, or e-mail
barry.jarlett@alanmann. co.uk.

Both systems have been approved by the FAA, which encourages use of child-safety devices on airplanes, but doesn't require them.