So, other than #6 & #7 above, does anyone know what METRO number each of the others uses on the radio?
Air1 is the Bell, Air2 is the first pictured MD530F and happens to be the newest, Air3 is the "stripped" MD530F which is used for search and rescue, Air4 and Air5 are also MD530Fs, which are used for patrol. Air6 and Air7 are the Hueys, which are used for search and rescue primarily (they do have a hoist/fast rope set up and can use them for SWAT though). Air8 will likely never be heard on the radio, but it's the fixed wing Cessna.
If you look closely at the tail of Air2 in the first picture, you can see the number 2 on the tail. 3, 4, and 5 have their respective numbers in the same place.