Detailed Instructions: Given a text, write a compressed version of it in a single sentence.
Problem:United 93 and the Shootdown Order On the morning of 9/11, the President and Vice President stayed in contact not by an open line of communication but through a series of calls. The President told us he was frustrated with the poor communications that morning.
Solution:
United 93 and the Shootdown Order On 9/11, the President and Vice President stayed in a series of calls. The President told us he was frustrated with the poor communications that morning.