Alright this is a list basically, this is my opinion if they are obsecure or no one has made it, make some corrections (incase)
Croatia Airlines (none)
Aegean Airlines (i have seen one, but none are that good)
Bonza Airlines (only 1 i could find)
Canadian Airlines (feeling to remove this but theres not that much)
Jet2 (not rlly that much)
Bangkok Airlines (barely exists in the site)
Reno Air (cant find any)
Air Cal (only 1 i could recount)
British Caledonian (where are the others :()
Monarch Airlines (barelh eixsts or none)
Condor (feeling to remove it but since most are planes with the name condor, not the airline itself)

Feel free to add some (this was all i could know rn)