Right now Missouri, Minnesota, Montana, Maine,* and Washington are all in the position to trying to make DHS blink before their residents stop being able to use drivers licenses to get on planes next January. 20 other states have an extension before DHS would make their IDs invalid.
*4 of 8 states that start with the letter M are fighting real id, 1 of 42 states that don't start with the letter M are. This relationship would be considered statistically significant (p = .0014 Fisher Exact Test). Which means absolutely nothing, it's just odd.