On August 30, 1928 the Federal Radio Commission issued General Order 40, a plan outlining a quota system for the reallocation of broadcasting stations. The Commission stated it would give stations an opportunity to examine the new assignments and challenge the potential changes, thus all station licenses were extended until November 11, 1928. On November 11, 1928, in an attempt to reduce interference, the Federal Radio Commission shifted the frequencies of many stations, and deleted others. All stations were now classified as Local, Regional, and Clear Channel.