rpstrong, the article says the masks did NOT deploy. Most jets have it in their After Takeoff or Climb Checklist to check the pressurization. Would make sense if the masks did not drop, it was noticed and the climb stopped prior to reaching the trigger cabin altitude. As for the number of people with medical issues, if the -900 had a full cabin of around 190 pax, 10 people having sinus/eustachian tube issues doesn’t seem to me to be a high number. Not to belittle their pain or discomfort.