VS and DL power supply question

I'm on a VS A346 to/from Boston in upper and then 4 DL flights around the USA (MD90, B737-7, MD88 and A320).
Two questions if i may:
I know on VS A330's there is USB ports, but is there an equivalent on the VS 346's (or can i use my charger adapter)? Also
What do the power ports on those DL plane types look like? Can i plug in my UK adapter or just a USB cable directly? (according to the app all but the A320 DL planes have power sockets).
Appreciate the info!
Two questions if i may:
I know on VS A330's there is USB ports, but is there an equivalent on the VS 346's (or can i use my charger adapter)? Also
What do the power ports on those DL plane types look like? Can i plug in my UK adapter or just a USB cable directly? (according to the app all but the A320 DL planes have power sockets).
Appreciate the info!