Since this is a proposal in Europe, no immediate danger in the US of losing the band. However, if Europe dictates the frequency for aviation, most other countries may feel the need to follow suit, or require two different radios and antennas or more complicated installations in any aircraft flying that way. To my mind the better option would be t0 split the current AM aviation band by using the top 10 AM channels to make 20 or more new narrow band FM channels. That would require less changes to the current installations, letting the old AM sets be used until a majority of aircraft have the new stuff installed, maybe 10 years down the line. Then swap over all channels to narrow FM. OR The current aviation band at 120 MHz could be replaced, but 140-148 MHz would not be the answer. Higher frequencies such as the former cell phone frequencies at 900 MHz or somewhere in the middle using the old UHF TV bands would allow smaller antennas and more bandwidth for more channels. But of course most of those frequencies have already been re-sold or allocated. At any rate, there is not much point in US hams 'sign the petition', as signatures from outside the EU will likely be ignored.