Is there a "window" for the launch? ie..if missed you have to wait 6 months or a year for next opportunity? Current launch date?
#JWST will go via Panama Canal to our launch site in French Guiana.https://twitter.com/Summer_Ash/status/793813454759071744 …
When NASA's says they are shipping #JWST, they mean an actual ship. 
@NASAWebb
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1. We don't have launch window the way planetary missions do and can launch through year. But...
End of conversation
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@Summer_Ash The type of ship is a "roll-on, roll-off", or "Ro-Ro". All together now: Ro-Ro-Ro your 'scope, on its way to launch...Thanks. Twitter will use this to make your timeline better. UndoUndo
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Why isn't it being launched from the US?
Thanks. Twitter will use this to make your timeline better. UndoUndo
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