It's almost certainly a Gray Angel. The clear edge of the tail fin is conclusive. The yellow at the caudal peduncle is characteristic common to both Frenchs and Grays. A dead giveaway, not observable from the pic, is the swimming pattern. Small French Angels swim with a pronounced shimmy, something like a Percula Clown, only much more exaggerated. Most of their motion at this size is a sinuous weaving, while juvenile Gray Angels tend to swim in more of a straight line. On the reef the different swimming patterns are very obvious. I don't believe there is any difference in the yellow band shape between juvenile Frenchs and Grays. The straight or curved band is a marker that differentiates Queens from Blue Angels.
I thought I was among fish nerds here. I've always enjoyed watching tiny angelfish in the Caribbean. They are among my favorites, and I've seen literally thousands up close over the years. There are some very shallow reefs where vast numbers of French Angels can be seen in almost every crevice at certain times of the year, some as small as a smartphone key. French angels are active parasite pickers and the sinuous weaving seems to be an advertisement for their services. I'm glad you appreciated my uninvited description.
You should not have too much trouble, I just came back from two trips and collected fish on both trips. Other then getting the license to collect the airlines have no regulations for putting fish in your checked luggage. According to the TSA website you can carry on a live fish if the bag is totally clear and they can see the fish is alive and swimming around. I called the number and they suggested I contact the airport directly to be safe, but I brought a few of the rarest fish I collected back with me as carryon and a box of live fish and inverts as checked baggage on September 17th with no issues at all. If you carry on any fish my only suggestion when you call is to write the name and ID of the agent you spoke with because the internet says it is up to the discretion of the officer on duty at the time, either that or just put the bagged fish in your checked bag.Before 9/11 I brought fish back almost every trip. Most went to friends, members of a local club, a few LFS, and a few rarities to a public aquarium where I was a docent. These days I still bring back one or two fish &/or inverts, just because I enjoy collecting and keeping a mini-aquarium in my room while on holiday. The paperwork and security issues have gotten wildly crazy. I posted on my public profile here a picture of a checked through cooler chest into which the govenment drilled several holes, obviously looking for drugs. Fortunately they did not bother my precious fish too much. It (a Spotted Drum) is still thriving almost two years later. I catch most of my aquarium specimens. Great fun.