On that date Messenger log-ins will no longer work and users must turn to Skype, said Microsoft in an email sent to all Messenger users.

BBC: Microsoft to turn off Windows Messenger on 15 March

But Lotfi Raissi's flight log book suggests he too flew in that Piper on that same date.

BBC: Lotfi Raissi transcript

The Syrian Electronic Army's typical tactics to date have included sending "phishing" emails to glean log-in information from unsuspecting victims.

BBC: Technology

The explanation - that Raissi made a mistake in filling his log book, that he had flown in the Piper not on March 8th, but March 9th, a date which tallies with flying hours that were also logged.

BBC: Lotfi Raissi transcript