Just landed in Houston. Gorgeous day. We noticed there were no other planes around. The terminal only had three planes at gates. (We later found out the ATC shutdown was underway but they elected to let planes close to their destination continue unmolested.)
Right after we landed, the normal friendly Houston Ground controller was all serious and busy doing something else. When he finally cleared us to the gate, he made a blanket radio call:
All aircraft on frequency... We were just advised that two 737's (They had the models wrong) have hit the World Trade Center buildings. This appears to be an intentional act." I told the passengers as we waited for our gate what we had been told. Just starting to realize the gravity of the events of the day, I finished, "This is an extraordinary day. You will remember it for the rest of your life."
After we got to the gate, there was no direction except that the ATC shutdown was in effect and we were grounded until further notice. The Houston passengers exited and a few were going on to Albuquerque with us.
Then, the Flight attendant in the back yelled, "They just hit the Pentagon!" That is when I knew this was an attack and we had all the passengers deplane with everything because they were not going anywhere on this plane for awhile.
We spent four days in a seedy hotel they managed to get for crews stranded in Houston. After two down days, we were told to report on the third day but they sent us home. Found out later that Herb Kelleher, our CEO who was the President of the Airline Association that year told the DOT to pound sand. Pilots were now the "suspects." They wanted pilots at every stop to get off and get frisked and have their luggage inspected in the Jetway in front of passengers. Herb pointed out that we could have crashed into a building on arrival. Plus, each cockpit has a huge razor sharp crash axe on the wall. After another day of no planes in the air, the DOT relented and we started flying the fourth day after the grounding.
I flew the leg to Dallas. I had that crash axe in my lap part of the way. At level off, I tried out a few defensive swings with it and told my partner (a former linebacker from the Air Force Academy), "Ken, the only person I can hit with this thing is you." He took it and agreed. He could hit me but hardly anyone else, even turning it around and using it as a bat. Two years later, both of us had been trained and started flying armed.