Wow... I can't believe the trouble I have been having while flying AA with my CPAP. I'm questioned about my third bag on almost every flight, and the response is rarely an immediate pass. They either want to see it, or they don't believe the rule exists. Tonight was the worst yet. Absolutely ridiculous and beyond irritating. Here is the email I sent to AA. I couldn't write the whole story, as they limit the number of characters in their complaint form. I'm missing my 1Kvoice email more and more. I have had trouble traveling with my CPAP since switching from UA to AA. Tonight's incident, however, takes the cake. When boarding this flight, an AA employee in the jet bridge who spoke very little English told me I could not bring 3 items on board. I corrected him. He didn't believe me, but he let me pass. The FA at the door ("Don" - Would not give me his last name) overheard our conversation and went into full power trip mode. He said, "No!" I explained again, but he insisted that I would have to check one of my items. I requested that he talk to the captain. He refused. I said I'm not going anywhere until you ask the captain. The captain allowed me to board, but wanted to speak with me. The FA said I needed a doctor's note proving I need it. When I spoke to the captain, he made the same claim, but he said it was no big deal tonight. The FA then forced me to move from the F seat I purchased months ago, stating, "Because you use oxygen, you can't be on the aisle blocking another passenger." I just moved, but it's wrong. The FA working the F cabin apologized very genuinely, and agreed when I said, "He's just on a power trip." The aa.com carry-on page clearly states that a CPAP is exempt, and says nothing bout a "doctor's note." I have never heard that in the 8.5 years I have been flying with my CPAP. This ruined my otherwise pleasant trip. I have AA flights tomorrow, Wednesday and Saturday this week, and no time for a doctor's note. What can I do to avoid a repeat? For those unfamiliar with a CPAP, there is no oxygen used in its operation, nor do I use it on flights. I carry it in order to protect it from damage, as any doctor or manufacturer would recommend. Has anyone else ever experienced such a thing? I have printed the aa.com page to carry with me, but it shouldn't be necessary. CPAPs are so common now that I don't understand how any airline employee can be unaware of the rules.