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I just acquired my first Quantum Leap for collecing 3 stars on Red Space missions - I note that I could get two more by completing 3 stars on Green and Blue missions - on both these I have a long way to go.  Do you think it is worth doing these (with their lower rewards) just to get QL or are there better/easier ways to accrue QLs without spending $$$?

In case it involves visiting destinations I am currently flying only Powerful Delta and Jumbo aircraft (using the Jumbos for map destinations currently)