Miami hasn't had a home regular-season game blacked out since 1998, but new owner Stephen Ross has said he wants to create more excitement about the Dolphins in South Florida and expand support for the team.
Since completing his purchase of the franchise in January, Ross has announced partnerships with six celebrities, most recently new limited partners Venus and Serena Williams.
The Lions on Thursday still had 1,700 tickets to sell by 1 p.m. Friday for the game against the Minnesota Vikings.
Detroit had 50 straight sellouts at Ford Field until Oct. 26, 2008, when it played the Washington Redskins. The Lions failed to sell out other games later in the season en route to setting an NFL mark with the first 0-16 season.
The Chargers were in danger of their first regular-season blackout since 2004. Both of their exhibition openers were blacked out, and the team has warned fans that there could be regular-season blackouts.
The team said 4,000 tickets remain for their game against Miami a week from Sunday.
The team received a 24-hour extension from the NFL because it still had 1,100 tickets unsold for their game against the Baltimore Ravens.
The Associated Press contributed to this story.