I'm afraid this flexibility will be a requirement - there is no way to predict this far in advance when or where the sakura will blossom.

The over-riding trend is for the blossoms to appear earlier and earlier each year, but there are exceptions (2005 is one). And wind and rain can make the canopies of pink a very shortlived phenomenon.

Here's a recent thread with discussion on dates and how they've varied
http://www.flyertalk.com/forum/showthread.php?t=728793

This thread has more info
http://www.flyertalk.com/forum/showthread.php?t=670808
Including this link: http://www.jma.go.jp/jma/en/Topics/l...007/sakura.htm for 2007

Check http://www.jma.go.jp/jma/indexe.html next year for 2008's forecast and plan accordingly.


----
Baggage:

Narita Terminal 1 - http://www.narita-airport.jp/en/guid...svc_06_t1.html

Narita Terminal 2 -
http://www.narita-airport.jp/en/guid...svc_06_t2.html