You do not need a spreadsheet. You need a working model.
Rough roles
- SAS — legacy network, domestic + international, loyalty gravity
- Norwegian — competitive trunk routes, leisure-friendly vibes, still a serious airline
- Widerøe — regional connective tissue
Codeshares exist. Your ticket brand and your operating flight can differ. Always check the flight number you will actually board on the live board.
Practical advice
Buy for schedule and baggage rules, not for logo romance. Then verify the morning of travel. Norway rewards people who re-check.
More context: When flight times keep changing.