Nah, mate!
Your radio is an airband receiver! Receives transmissions only. NOT able to transmit - you'd need a transmitter for that (and your mostly definetly NOT allowed to transmit on the ATC freqs
)
Airband listening is license free (think about it, your Maycom was bought over a counter or mail order etc) although as someone mentioned earlier; a radio amateur license lets you transmit(or listen) on the various amateur bands.
Besides, you don't want to send messages on an airband frequency anyway!