We (3 couples) are hoping to go on the Nov. 29 Christmas Market Danube River Cruise. We are staying another week on our own, till Dec. 11, so today was our 330 day opening day to book. We've been trending prices for about 2 weeks anticipating today (just punching in different dates, but leaving and returning on the same days of the weeks that we are actually going). The prices have been about $1387 for Delta ComfortPlus. On occasion, about 2-4 hours per day, they would change to $914. Today, they were $847 - MultiCity - into Vienna and out of Munich. We did book, but within an hour, they were back to $1300. Now they are again $847. We did call Tauck and for the same itinerary, their price was $1536 - we are paying $847 booking direct with Delta. We are covered with our Trip Insurance if Covid cancels us. Plus, this year, we canceled a couple flights on Delta and AA and got full refunds because of Covid. We have NEVER gotten airfare to Europe so cheap. Here's hoping we actually get to go. Most of us are Nurse Anesthetists, so we've been vaccinated.