How does airline systems recognise a flight as connecting flight?

making international trip malaysia uk. flying klm malaysia paris , easyjet paris london, few hours layover in paris cdg airport. tickets both flights booked separately @ klm , easyjet websites.

question are:

1. easyjet flight considered connecting flight can check luggage straight london when depart malaysia?
2. how airline systems recognise easyjet flight connecting flight?

i making international trip malaysia uk. flying klm malaysia paris , easyjet paris london, few hours layover in paris cdg airport. tickets both flights booked separately @ klm , easyjet websites. question are: 1. easyjet flight...

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