Originally Posted by
arf1410
Even though I called and had them manually add the number, it wasn't there at airport checkin. Ugh. Fortunately they added it then and all good. I always thought airlines needed 24 hours to "process" the ktn. Guess not!
I also thought that the 24 hour thing was necessary. However, one time I forgot to add it to my Alaska ticket and ended up in a huge line for normal screening. While in the line, I asked myself why not try it, and I added my traveler's number and re-checked in (I guess you can do that with Alaska). And guess what? Tsa precheck showed up! Then I left that line/queue and went for TSA precheck.
These days TSA precheck seems to have longer lines, sometimes longer than not having it. It's still great that we don't have to take shoes off, laptops, etc.