4 bases in Alabama have to have their own districts:
- African-American (7)
- Mobile (1)
- Huntsville/northern tier (5)
- Birmingham suburbs (6)
This all points to the 3rd district being dismembered or moving so far north it's effectively a different district.
But the 3rd is on the eastern boarder. It makes more sense to just expand it into AL-6 and move it north so AL-7 can get more AA voters. Then cut off that northern part of AL-6 and give it to the two northern district.
Removing AL-3 altogether would require basically an entirely new map.