A box with an Aug. 4 Business article incorrectly described Hertz as the largest auto-rental company. Enterprise Rent-a-Car is the largest in North America in rental revenue and fleet size, although Hertz has the largest share of rentals at airport locations.

An Aug. 3 article on the crash of an Air France jet in Toronto incorrectly reported the view of John Cox, a safety consultant and former head of safety for the Air Line Pilots Association. Cox said that the grooves in the Toronto airport runway help prevent the buildup of puddles, which limits hydroplaning.

The Aug. 2 Business Class column incorrectly described a new upgrade program offered by United Airlines. For an annual fee of $300, United will allow passengers to upgrade to Economy Plus seating, not business class, on all domestic and international flights.

The Washington Post is committed to correcting errors that appear in the newspaper. Those interested in contacting the paper for that purpose can send an e-mail to corrections@washpost.com or call the main number, 202-334-6000, and ask to be connected to the desk involved -- National, Foreign, Metro, Style, Sports, Business or any of the weekly sections. In addition, the ombudsman's number is 202-334-7582.