Where are you located? What kind of antenna are you using? The rubber duck that came with your scanner is not the best antenna for airband. In fact, unless you monitor from the airport, don't expect to hear much on it.
You may want to consider an outdoor antenna such as a discone or Scantenna (antennawarehouse.com). It doesn't even have to be mounted outdoors for it to work better than your rubber duckie. But if you can put it outside, by all means do it!
I live about 40 miles from ONT
and can hear the tower when using an outdoor antenna. I can also pick up BUR
ATIS from my location which is about 90 miles away. And in Utah, I can hear the SLC
ATIS from about 100 miles away (this while in the car with an external antenna on the roof).
If you want to go "all out" try a yagi (directional antenna) cut for airband. They are very directional but offer gain and will likely improve you signal quite noticeably.