I had a 2-hour layover in Orlando on October 30th which should have been enough time considering I didn’t have any luggage. The plane landed at 5pm, but due to congestion we were not allowed to disembark until 6pm. Since I knew I wasn’t going to have much time, I downloaded the Mobile Passport App to make immigration faster (I had very good experiences with the App in ATL and JFK). However, when I noted to the staff at immigration that I had submitted mine through Mobile Passport, she rudely said that they "weren't doing that". Thankfully the line for US citizens was short and I was out of there in 15 minutes. I followed the signs for connecting flights and had to go through security to get to the main gates, which didn’t take long. Unfortunately, when I got the gates and I checked to screens to confirm my gate number, I noticed that my flight was not posted. I asked a friendly staff in the information kiosk and he informed me that I must be at the wrong terminal and I had to take a shuttle to the correct terminal and get out of the airport and go through TSA again. I panicked since it was 6:15pm and my flight was supposed to start boarding at 6:20pm. I arrived at the correct terminal and spoke with a staff member at the exit and she advised that indeed I would have to go through TSA again. When I told her that my flight had started boarding she said “Yeah, you’re definitely going to miss your flight.” Once I arrived at security check I looked for the TSA pre-check line (which I have) but didn’t see it, so asked the person directing everyone in line and I also mentioned that my flight had already started boarding and he said “You’re probably going to miss your flight but just enter here and ask the staff at the front if you can go in the priority line.” When I arrived at the front of the line before the boarding pass check, I asked the staff member if I could go in the priority line since my flight had started boarding and she said “no, sorry!.” I started panicking, so I asked if the fact that I have TSA Pre-Check made a difference and she said “uhm, TSA pre-check is on the other side” and pointed me to it. I rushed over to the TSA pre-check area and was able to complete the security check in 15 minutes, which compared to everything else in this airport, it was a breeze. Finally, the inefficiency of this airport worked to my advantage and although I arrived 5 minutes after my flight was supposed to take off, there were people still boarding the plane. Moral of the story, I just came believe I had so many staff member telling me that I was going to miss my flight, but none tried to do anything about it. I also don’t understand why the TSA pre-check line is so hidden that not even the staff members know where it is. You can do better Orlando.