As titled, a staff of San Diego airport was so sweet and patient to people lined up for some possibility or options, including me. And the in-flight staff from San Diego to Chicago is also very nice,... As titled, a staff of San Diego airport was so sweet and patient to people lined up for some possibility or options, including me. And the in-flight staff from San Diego to Chicago is also very nice, providing water so many times. The 3 star is because staff of ORD didn't behave the same way. One of them at the gate wanted to re-check my carry-on luggage size with a disdain face , which was bought according to carry on instruction. She mumbled how I should put my luggage in that size standard bar, pulled it out and dumped it back very roughly when I put it in wrong direction. It turned out perfectly fit, but she still mumbled something like "can be squeezed".