You have a nice programming software here:
Scan125 Control Program
The UBC125 covers from 25MHz to 950MHz including military air and has one of the best receivers for air frequencies. It can search the whole VHF air band in 8 sec using 25KHz steps, not too bad, and when you hit a frequency you can program it to a channel memory. The Scan125 program can log and save all hits so it will be possible to let it run unattended when you are not actively using the scanner to catch all frequencies you can monitor in your area. If you invest in a SDR dongle it can search the whole VHF air band in 2 sec, and then program its findings in the scanner.
For VHF air it would improve reception a lot if using a bigger antenna. A 1/4 wave antenna for VHF air are 50cm long and there are telescope antennas that can be extended to that length. A full size discone antenna are perfect to monitor both the civil and mil air band and connect that with a RG6 coax and you'll have the best possible setup.
Frequencies to enter from the start are those at 123MHz that are used for intercom between aircrafts and also to ground people when helicopters do special lift operations. At 131MHz band there are the companies internal frequencies where they report of problems and issues. There's also an intercom frequency at 121.100MHz where pilots chit chat unfiltered with each other at high altitudes.
/Ubbe