Some Skill and a helluva lot of luck.
One of the earlier posts hit is right on the head.
These targets are not designed for dispersal bombing. But I guess it all works out, using the formation option.
Think about it. A B-26 (My ride of choice) can haul 4000 lbs. Pre-1.10, that was enough for 1 FH and 1000lbs left over for the town. Now, a flight of 3 26's carrying 12,000 lbs has enough ordinance to knock out all the FH's at a medium base. So to keep it fair, you have bomb dispersion. Otherwise, a single pilot could knock a medium field out of commission, which is highly unrealisitc.
The most damage I've ever done since 1.10 was in a 3 ship 26 formation, killing 2 FH's in a small field.
Like Oed said, it is, and should be required for a concerted effort among multiple bomber pilots, to knock out a field, and capture it.
I said it before, and I'll say it again. This new bomber system is great! It really thinned the ranks and when the dust clears, only the most dedicated Bomber pilots will be left conducting raids. I'm all for specializing in one area, though I will dabble with fighters, etc, when I don't have time for a full bomber sortie.
The suicide dive bombing of a heavy, in my opinion, is just Arcade game dweebery. Unfortunately, I think it will continue for quite some time.