like normal airlines???? My aren't you the funny one! 🙄
Flying to half of its European destinations for only few month a year is not the hallmark of a serious international carrier. CO serves some fairly small European markets such as BRS (Bristol) and manages to do so year round. It seems that US should be able to so with the likes of ATH and ZRH, even if just 4 times a week.
CO makes smaller European markets work but they also seasonally cut service. EWR-FCO is 2x daily in the summer and 5x weekly in the winter. PHL-FCO is daily year round, with maybe a month or so of reduced service