KLM insist on sending me all sorts of offers in email since I am a member of their frequent flyer program. In the beginning I would just filter and tag them in Gmail, skipping the inbox, and then occasionally read through them on the off chance that they actually had something relevant to say.
They have yet to send me anything that would be worth sending me email about.
So now I just bin all the rubbish they send me without even looking at it.
Want my attention? Get some usability-people to work on your website, fix customer-support so the support people can help passengers regardless of where the tickets were purchased, fix the frequent flyer mile registration and then send me an email.