The last time I travelled overnight, I carried my SC62 (not the sc62w because I might cry if I lost it) and my DQG Slim AA Ti, plus a small USB single-cell Li-Ion charger. The Slim AA looks better if I have to appear more formal, and it can also use AA in a pinch (though I carry it with 14500). Empty spare cell holder is packed somewhere - they’re basically disposable to me at this point, I have so many, and I can safely store cells there if needed.
Depending where and how I’m traveling I generally have something simple like a convoy S2+ as its cost effective and does the job and not a total loss if it goes missing and as of recently a nitecore Tiki thats been attached to my keys.
I air travel with a SK68 and a pocket edc (DQG tiny aa) typically, camping is a different story, thrower (wurkkos ts30s), flooder (sp36), headlamp (sk40 or HD20) and something small for pocket (varies)
My travel light last time (to another city, to see my brother’s father) was a Convoy S2+ with SST20 2700K. It worked well for everything except as a bedside light, the spot was way too intense even at 0.1% mode. Now that I put a 30° TIR on it, it should be much nicer.
Any regular flashlight wouldn’t be taken by TSA, unless it has a tool kit included, very sharp edges, or it can be used as a baton due to weight (ie large Maglight).
There is a maximum WAh for lithium, but a normal flashlight wouldn’t be a problem. Been flying with flashlights for decades and nothing happened.