Mike over at Communicatio is expecting complications with big-name speakers due to the newly onerous airport security restrictions. He says:
If this is true, and I have no reason to believe it's not, watch out for major headaches down the road—and increased costs for flying the big shots in.
By the way, I just found Mike via the newly spiffed up Association Blogoclump site. Check it out for some interesting voices in all things association, including meetings.