Led Zeppelin sold out Detroit (Mich.) Cobo Hall without a single ad appearing anywhere, according to Concerts East's Tony Ruffino. Firm never ran one ad, with all tickets sold through facility's mail order solicitation. Opening date for the Zeppelin's U.S. tour grossed $76,000, June 6.

Following night, Zeppelin, co-promoted by Donald K. Donald Productions and Concerts East, tallied over 50 per cent advance with Montreal Forum scaled to $92,000 (7). Two nights later, Zeppelin booked into Charlotte (N.C.) Coliseum, registered over 50 per cent advance sale one week prior for Concerts East (9).

At Buffalo (N.Y.) War Memorial Aud, Zeppelin scaled to an $85,327 potential gross, tallied $75,000 ten days prior for Concerts East (10). At Baltimore (Md.) Civic Center. co-promoted by Richard Klotzman's National Attractions and Concerts East, Zeppelin registered about $70,000 out of a potential $88,000. 11 days prior (11).

At Philadelphia Spectrum, Zeppelin, co-promoted by Electric Factory Concerts and Concerts East. tallied $65,000 out of a potential $90,000, 13 days prior ( 13). Zeppelin's eastern wing of its U.S. tour climaxes with two sellout concerts at Uniondale (N.Y.) Nassau Coliseum, which registered $192,000 for one month prior (13-15).