And a wikipedia link with the full series listing for those who may be interested in a particular episode:
en.wikipedia.org/wiki/Mayday_(TV_series)Season 1
Episode 1: Unlocking Disaster (United Airlines Flight 811)
Episode 2: Racing the Storm ('Fatal Landing' by National Geographic (American Airlines Flight 1420)
Episode 3: Fire in the Sky ('Fire On Board' by National Geographic) (Swissair Flight 111)
Episode 4: Cutting Corners ('Fatal Error' by National Geographic (Alaska Airlines Flight 261)
Episode 5: Flying Blind (AeroPeru Flight 603)
Episode 6: Flying on Empty (Air Transat Flight 236)
Season 2
Episode 1: Wounded Bird ('One-Wing Flight' by National Geographic) (ASA Flight 529)
Episode 2: Blow Out ('Ripped From The Cockpit' by National Geographic) (British Airways Flight 5390)
Episode 3: The Killing Machine ('Hijack Rescue' by National Geographic) (Air France Flight 8969)
Episode 4: Deadly Crossroads ('Mid-Air Collision' by National Geographic) (Bashkirian Airlines Flight 2937/DHL Flight 611)
Episode 5: Lost ('Crash on the Mountain' by National Geographic) (American Airlines Flight 965)
Episode 6: Missing over New York ('Deadly Delay' by National Geographic) (Avianca Flight 52)
Season 3
Episode 1: Hanging by a Thread (Aloha Airlines Flight 243)
Episode 2: Attack Over Baghdad (DHL shootdown incident in Baghdad)
Episode 3: Out of Control (Japan Airlines Flight 123)
Episode 4: Fight for Your Life ('Suicide Attack' by National Geographic) (FedEx Flight 705)
Episode 5: Mistaken Identity (Iran Air Flight 655)
Episode 6: Bomb on Board (Philippine Airlines Flight 434)
Episode 7: Helicopter Down (G-TIGK North Sea ditching)
Episode 8: Death and Denial ('Egypt Air 990' by National Geographic) (EgyptAir Flight 990)
Episode 9: Kid in the Cockpit (Aeroflot Flight 593)
Episode 10: Greek Ferry Disaster (under 'Crash Scene Investigation') (Express Samina)
Episode 11: Head On Collision (under 'Crash Scene Investigation') (Hinton train collision)
Episode 12: Ocean Landing ('African Hijack' by National Geographic) (Ethiopian Airlines Flight 961)
Episode 13: Runaway Train (under 'Crash Scene Investigation') (San Bernardino train disaster)
Season 4
[10 Episodes currently in production for broadcast in 2007]
Season 5
[13 Episodes currently in development for broadcast in 2008]
Off-series episodes
Crash of the Century (Tenerife disaster - originally a 2-hour one off production