It is indeed Condor.
They went from the original yellow followed by the Thomas Cook blue livery and now they have adopted the new TOC livery which is back to the yellow (and grey/silver).
They were the first operator of the Boeing 747 with two -230B in the charter and holiday sector.
The sister airlines are all called Thomas Cook Airlines (UK, Scandinavia and Belgium) and all bear the Thomas Cook name on their sides but Condor kept its own name.
They have been recently expanding a lot in the USA by adding for example Baltimore (BWI), New Orleans (MSY) and Seattle (SEA). The newest one will be Pittsburgh (PIT) tomorrow.