Does this happen every day?

Two planes arrived at Logan this afternoon (Delta from Paris, Avianca from somewhere) with sick crew members and passengers. Police met the planes but didn't require anybody to be taken by ambulance, or other passengers to be checked. Some people were using oxygen (can you make it fall down from the ceiling even though the pressure is OK, or are there tanks with the first aid kits?). It wouldn't surprise me if there were seriously ill people on flights every day, but one rarely sees reports.