This was purely a surveillance mission and I would think they won't use 14 people for their eventual attack. They wanted to create a situation to see how American passengers and US security would react to:
14 noticeable suspects
2 groups of 7 men
1 suspect in first class near the cockpit
13 suspects spread out throughout the plane
All from Syria
One way tickets
Consecutive use of restrooms by the men
These men can report back that they were free to do what they wanted until after they landed and while the passengers were nervous, no one did anything.
They can also report back about their interrogation by the FAM, TSA and FBI.
This is not good.
I agree this was a surveilance mission, but I don't believe they were practicing to blow up a plane. The goal remains to take over a plane and kill thousands and not hundreds.
I agree with you and the other posters who said they wouldn't waste 14 men on one mission and that this therefore has the appearance of a training or reconnaissance mission. Their openness suggests smugness and cockiness, the implication of which is that they think we're still too stupid and incompetent to stop them. And they're probably right.
Could they have been training multiples teams?
Exactly. What is sad is no one, NOT ONE, person did a thing. We did not learn a thing. Did Todd Beamer and the other 3000 die for nothing?