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.