CREATE TABLE table_50772 ("Episode" CLOB, "Air Date" CLOB, "Timeslot" CLOB, "18-49" CLOB, "Viewers" FLOAT)

When did the episode air that had 7.3 viewers?
SELECT "Air Date" FROM table_50772 WHERE "Viewers" = '7.3'
SELECT "Air Date" FROM "table_50772" WHERE "Viewers" = '7.3'