That is a weird passage. A quick web search showed me that many other people have asked this same question. I found a couple of links that might be helpful.
#76. One Is Taken, the Other Left (Luke 17:26-37) -- JesusWalk
http://ezinearticles.com/?Whatever-...y,-There-the-Vultures-Will-Gather!&id=2360623
Those were the experts. This is how I would explain it:
You have to read the whole passage, meaning from verse 20 all the way to verse 37. In verse 20, Jesus is asked a question by the Pharisees, He answers them and then turns to His disciples and says verses 20 - 36. Then verse 37 is another question
"Where Lord?" they asked." Is "they" the disciples, or is "they" the pharisees asking another question, even though Jesus has turned His attention away from them? This, I think, is important to know, to be able to understand the vultures comment.
Picture the scene being played out this way. Imagine a teacher teaching her class. The class clown, trying to get attention, asks an annoying question, probably the same question he has asked a dozen times already. The teacher answers him quickly, with a sigh and hoping he will shut up so she can get on with instructing the class. She turns back to the class, who is quietly paying attention to the lesson. Part of the lesson is (not in so many words, but) "Pay attention and learn what I am teaching, so you won't be like the class clown here, always asking and never understanding." The class clown, totally missing the point of the lesson, pipes up again with a variation on the same question. The teacher then says to the class "See what I mean? He doesn't listen and so keeps asking questions that have already been answered."
Now Jesus would never get frustrated like the hypothetical teacher, nor would He ridicule the class clown in such a way. I am just using it as an illustration so that we have a picture of how a human teacher might have played out the scene. That is something we can easily imagine. Now replace that teacher with a perfect God in the same situation, and I think we can better understand what was said and how it was meant in the book of Luke.
So I think that the "they" asking
"Where, Lord?" are the pharisees. Pharisees are very legalistic and want concrete answers. They are also very fond of being in charge. If they knew exactly where and when, that would put them in a position of power and profit. Today, we use the term "vulture" to describe someone who profits from the tragedy or suffering of others. Jesus had just been saying that things will get very bad right before He comes again. If the pharisees knew where and when, they could capitalize on the fear and uncertainty people have when going
through bad times. The pharisees would say "I know the answer. I will save you. Follow me." He warned us of these modern day pharisees in verse 23 -
People will tell you, ‘There he is!’ or ‘Here he is!’ Do not go running off after them. Only God knows the answer. Only God can save you. God is the only one you are to follow.
<inserting my usual disclaimer - "I am not a Biblical scholar. I may be wrong. This is only my personal opinion. Take it or leave it. But I hope it is helpful.">
Be well,
~A