Pneumonia or Legionnaires Disease?

Iam recovering in hospital for 2 weeks after being admitted with pneomonia but as i did not respond to treatment the doctor is now treating me for Legionairs Disease possibly caught on board an aircraft,

Anyone know the main differance between the two and if its possible to catch from aircraft air conditiong system?

Before i became ill was on a long haul flight 2/3 days before with faulty system,too hot and then freezing cold.

Thanks

Legionnaires' disease is a severe bacterial infection of the respiratory tract, caused by Legionella pneumophila.


Description of Legionnaires' Disease
The disease acquired its name as a result of an outbreak of illness during the 1976 convention of the American Legion held in Philadelphia. At least 180 American Legion members attending the conference contracted a mysterious pneumonia that did not respond to conventional antibiotic treatment. Twenty nine people died. Eventually, the villain turned out to be Legionella pneumophila, a bacteria that was proliferating in the hotel's air conditioning system. Other outbreaks have since occurred in the U.S. and Europe. http://www.healthscout.com/ency/68/515/m...