Just try to 'become' one of them by adding lower cost flights. If there are already low cost airlines operating there just make prices lower so that any new competitor wont be able to add routes without bankrupting themselves. Even other spam lines eventually face intense competition and they sometimes miss highly demanded routes. Being a spam liner only annoys other players and isn't always bad as long as you don't use exploits. I'm not that experienced but I already experienced my airline growing very fast financially by adding routes even with competitions. You will always have to look for highly demanded routes where competitions are inevitable. So face it or risk going bankrupt.
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