Funny that when someone looks up the non-sellout games for the Cowboys since they started to televise home games if sold out that the1987 strike season and the 1st game of 1990 are the only ones that are listed.
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Since Dec 1990 the Cowboys have had consecutive sell outs.
As far as the rest , like I said I was there . I was a season ticket holder from 1971-2008. Mandated black outs didn’t begin until 1973 which required selling out 72 hours in advance. Before 1973 all home games were blackout locally.
Cowboys had blackouts even during heyday in the 70’s. Not many and usually a small amount like a couple thousand. And there were times when local tv affiliates bought the remaining tickets to broadcast.
But the late 80’s were more drastic with some games even after the strike in 87 having less than 50,000 in attendance. Too many tickets for local affiliates to purchase. Cowboys revenue begin to be effected and by 1989 Cowboys were losing about a million a month which 30 years ago was a significant amount.