Join Date: Oct 2007
Location: Catania, Sicily/South Jersey (PHL)/Houston, Texas/Red Stick/airborne in-between
Programs: United Global Svs, AA PlatPro, WN RR, AZ/ITA Freccia, Hilton Diam, Bonvoy Gold, Hertz Prez, IHG
Posts: 3,548
I've flown with license plates (US Style) in my carry-on a few times and they often get pegged for second hand inspection by TSA. Once they see what they are I am cleared save for sometimes inane questions about why I have them which I do not answer. For you, as others noted, declare them as a medical device and you should be fine.