Yes, I had a ticket itinerary and receipt issued by United, a UA confirmation code, an LX confirmation code, and assigned seats that I had made over the phone with LX in May and viewed online on the LX website several times since. The flight still exists (I tried a dummy booking, and there is paid J availability on the same flight number at the same date and time). Swiss Air just made the unilateral decision to delete our reservation without any notice.