This^^ Beat me to it.
Or just retired professional pilot. I consider myself an ex-aviator.
Now there is the baggage that the US Navy formally calls their airplane drivers “aviators” while the other US services make do with mere “pilots”. So there’s some small tendency for ex-USN folks to like that word “aviator” more than most.
If ex aviator, s/he had room to insert a space:
X AVI8R
That’s why I think it’s a pilot named Xavier.
I saw all of these within feet of each other in a shopping center parking lot. I would have been happier if they’d been comprehensible to me.
HATR4FC2 ? a white Lexus sedan, car dealership plate holders
FEMCHO ?? a small red sedan
TT BUN The driver had her hair in a bun, but what’s the TT?
DIZGNR designer? a green compact SUV
CHI2SAC The driver must have moved here (Sacramento) from Chicago.
I believe that’s “Hate traffic too”. The T does double duty, the 4 is an A, and the 2 is too:
HATe TRAFfiC Too → HATR4FC2
I bet that’s the female version of “macho”. She’s femcho.
In some US circles, and in some Latin countries’ slang “macha” means “lesbian” and especially butch or top lesbian.
This person might be that, or might just be a proudly get shit done capable kinda gal who takes no guff.
What kind of car? Many cars over the years have come in a trim level named “TT”.
The Spanish word for aunt is tia. The German word is tante. “Titi” is a slang / endearing term for aunt in both languages.
Could be that. A mid-late life adult with no kids and no prospect of having them (like me) may well adopt their Aunt or Uncle-hood as a big piece of their identity.
2018 SS on a (presumably) 2018 Camaro convertible. It was also a “Redline Edition” according to the badge.
RPE 11 on a white Ford Fusion. I have no idea what that one means.
8COSMOS on a high-viz yellow-green Tesla Cybertruck
6★SUB3 on a silver Porsche Macan
DNT PNC1 = don’t panic!
I’m not a Cosmo drinker; IMO they’re for girls. GF has one now and again. Too sweet for me.
But I’d probably need to have about 8 to buy a CT and wrap it in dayglo Gatotrade green.
There was a semi who didn’t make a turn and was blocking the major northbound road I take into the office. I was stuck in the logjam behind someone with HUMBLE on their license plate. Small, gray, sporty looking car, not quite sure what it was… you’d think I’d remember as long as I was sitting in traffic.
I SEEK on a white BMW 3 sedan
I saw a really neat plate the other day. But sorta like you damned if I can remember it either.
But what was noteworthy about my situation was that the custom plate car had crashed. Into a tow truck. Talk about convenient! It’s right there when / where you need it with no waiting and it was empty. And not so badly damaged as to be out of commission. Unlike their car which was a mess. 
Scored 3 today.
BRINA⎵1 on a FL standard plate on a generic standard sedan. I knew a woman named Sabrina who went by “Brina”. I expect this car belongs to a similar lady.
SUDAN2 on a Quebec standard plate on a pickup truck. A shoutout to their ethnicity or their name? No clue.
HONOS on a FL standard plate on a Lamborghini SUV (Yes, really, they make SUVs: Lamborghini Urus). It had a Vanderbilt University license plate frame. Apparently graduating from Vanderbilt with honors, pardon me, honos, pays well. Or Daddy had money as the case may be.
Another name, PATEL S1 on a Honda Accord
I guess many people put their names on their plates. I never would.
JAGER 9 on a Jeep Wrangler Rubicon built for some lite rock crawling.
What does jager mean? I searched - Jäger is a German term meaning “hunter” or “gamekeeper”. Primarily an occupational surname, it also refers to light infantry riflemen.
Usage Examples:
Military: “The Jäger units were deployed for reconnaissance”.
Noun/Occupational: “He was a skilled jager in the forest”.
Okay.
MAZIN Y on a Tesla Model Y. Meh, I don’t think Teslas are that ‘mazin’.
G
LF 18 on an Escalade. That does seem like what someone who loves 18 holes of golf would drive.
Something like 7555 WX on a Maine plate. I assume that’s just a standard series plate in Maine, but I just thought it was interesting to see a vehicle from that far away. And I guess Maine is sparsely populated enough that they don’t need as many characters as we do in CA.
TRONTZ on a Cybertruck. Maybe it’s his name.
STAN KK on a Mercedes SUV. Another name.
A good friend of mine has this. Though not with the 1 (he managed to include the A), and it is a reference, in his case to the Hitchhiker’s Guide to the Galaxy. It might be the same for the one you saw, or just generally good advice
//i\\
There is a car with a Wyoming plate that lives in my building’s garage. I haven’t met the owner. It has 3 seemingly random digits. There’s a 4th smaller digit off to the side that might indicate a county or region or something. But the whole plate taken together has 4 digits. Period.
ETA: After some research, WY has about 20 counties. And about 275,000 citizens. So clearly they have more than 4 digit plates. And the 4th smaller digit is probably not about counties.
I wonder if the plate here is some sort of antique. Next time I see it I’ll have to note the digits; they might represent something other than random.
E2TA: More research here indicates they do use a county number on their plates: Specialty Plates - WY
Possibly a Girl Genius (online comic) fan.