Don't think you can blow bridges. Shame really.
But if you could I am sure it would be stopped because after all can't have the airfields not getting supplies can we. 

If you look at the last 3 changes in gameplay -
A = Advantage
D = Disadvantage
N = No change
                                     Furballers  /  Landgrab  /  Buffs
No night A /  D /  D
No fuel below 75% A / AorN / N
Buff gun 1k converge  A /  N  /  D
Think you can see the direction the game is heading.
Feel free to chime in if you think my grid is inaccurate or need a category added.