NBC Sunday Night Football - Wikipedia
NFL owners approve flex scheduling for 'TNF' games
Analyzing impact of NFL rule changes on Broncos
Sunday Night Football flex of Dolphins vs Chargers was almost Bills vs Jets - The Phinsider
The NFL could end up flexing Thursday Night Football games
NFL's Monday Night Football flex policy will be similar to Sunday Night Football flexing
NFL owners approve modified 'Thursday Night Football' flex plan by a vote of 24-8, per report
Dolphins-Chargers flexed to 'Sunday Night Football' in Week 14
Every NFL game flexed out of Sunday Night Football since 2006
The 'Thursday Night Football' flex proposal is a reminder the NFL is a business - Sports Illustrated
NFL schedule 2019: 5 'Sunday Night Football' games likely to be flexed
Why NFL flexes games and how changing the schedule works – NBC Sports Bay Area & California