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On the subject of Norwegian, after a long period of stagnation, they are expanding Manchester ops.
Stockholm moves to 4 per week, with a new Thursday and Sunday flight that arrives at 0850.
Oslo gains a 4th weekly flight on Sunday evenings.
The flights can only be booked as part of connections thus far, so, there may well be more to come.
Overall, Norwegian is 10 weekly over 3 destinations.