If you missed GW2 2015 April Fools or want more of it, you can now relive it with the Aviator’s Memory Box on the gemstore for 400 gems.
This little box can be used by anyone once summoned but cannot be used in sPvP, dungeons, or WvW. Once used, it will transform you and only you into the airplane mode until you zone or log off. Other players still see your character normally and do not hear the voice over sounds. The special death music is also there.
Also note that the box will remain for a few minutes after summoned and you cannot summon another one while the previous one is still up (doesn’t disappear when you log off or zone out either).