I heard in the not too distant past that OSP also had a fixed-wing plane they used on special missions.
Planes are not even close to what a copter can do for urban policing. But it is true as said in an earlier post, they are costly to deploy mainly because of the demanding maintenance schedule that is a daily matter.
I'm not sure what the exact cost is now, but when In was dispatching at LA Sheriff earlier in the new millenium the department billed contract cities an auditor verified rate of over $200 each 15 minute period. ($1,000 an hour and FAA rules dictate you can be up in the air no more than 4 hrs in 8 hr shift.)
But when they are up they could get from the I-5/Banfield area anywhere in the city in about 90 seconds or less, and that would be a great deterrent to the thugs in N.E. if they had to think twice about how far can I get from this felony I just did in 60-90 second before the PoPo is overhead.
I got a bit of a chuckle about an earlier mention about the noise driving the neighbors crazy, and I will confirm that you could hear those old Bell copters long before you could see them. Now LASD uses the much quieter Hughes MD500 that I really only hear until it's almost overhead because it uses NOTAR instead of a rear rotor.
I will go out on a not so high limb and, predict that while you've got a great, well-educated/professional bunch of cops at PPB, this is the city that flipped out when Bratton brought 'tactical response squads' to town, and there is not enough intestinal fortitude down at City Hall to ignore the rantings from the likes of COPWATCH that would come unglued at the notion of having cops in the sky keeping the peace.