Is it the correct sentence?

layla1234This plane had been flying in Greek airplanes

That means nothing. Did you type carefully?

I mean that Greece had this type of plane and it used it for a several years so the plane had been serving Greece for a couple of years before it finished its work.

Mister Micawber layla1234This plane had been flying in Greek airplanesThat means nothing. Did you type carefully?

Where did you read this, or did you write it yourself?

This plane had been flying in Greek airlines for 15 years. Today was its last flight.

I am just thinking of some grammatical aspects how to express some ideas/things in English. So how can I change the sentence to make it correct?

It has flown in Greek airlines or It has flown for Greek airlines for a couple of years?

Pilots fly for airlines.

Airliners, airplanes and jet planes are in the airlines' fleets.

Ok I see. so can you help me to identify what tense I should use here to be correct?

This plane has been/served (without in) in the Greek airlines' fleets for 10 years before it stopped working?

This plane served in the Greek airline fleet (one plane, one airline, one fleet) for 10 years before it was retired / decommissioned / removed from service.

Was that the wheels up one? Please explain what this means.

Clive