The Port Authority of New York and New Jersey was formed in 1921, and the Newark Bay Channels were authorized by the Rivers and Harbors Acts in 1922. Shipping operations languished after the war, and in 1927, the city of Newark started construction of Newark Airport (now known as Newark Liberty International Airport) on the northwestern quadrant of the wetlands that lay between Port Newark and the edge of the developed city. The port authority took over the operations of Port Newark and Newark Airport in 1948 and began modernizing both facilities and expanding them southward.