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From Wikipedia :
"The airband uses the frequencies between 108 MHz and 137 MHz. The lower part of the band, from 108 to 117.975 MHz, is split into 200 narrow-band channels. These are reserved for navigational aids such as VOR beacons, fan marker beacons, Automatic Terminal Information Service (ATIS) and Automated Surface Observing System (ASOS) messages, and precision approach systems such as ILS localizers or LAAS.[2][3][4]"
So Yes, the band does go down to 108 mHz, but that end of the band is not used for voice transmissions, so not included on many "aircraft" radios sold to the public.
jr
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