I'm talking about customer facing - TCX is no longer used on FIDS, customer paperwork or operations paperwork and is always MT. NCL recognises that Thomas Cook Airlines is a scheduled airline. But I agree, many pax are usually Thomas Cook holiday customers, similar to Jet2/LS.
Regarding cabin baggage on E190's - yes it will be permitted on board due to larger overhead lockers - the same as KL's E170/90's.