Sources:

http://www.terminalu.com/travel-news/japan-tsunami-travel-update-tokyo-flights-resume-governments-advise-against-travel/6944/
http://www.torquenews.com/106/nissan-resumes-production-after-earthquake-toyota-mazda-suzuki-and-honda-follow
http://www.caradvice.com.au/114638/toyota-japan-to-resume-production-at-all-plants-on-april-18/
http://www.autoguide.com/auto-news/2011/04/honda-to-resume-japan-production-on-april-11.html
http://www.agweek.com/event/article/id/19155/
http://jprail.com/destinations/tohoku-yamagata-and-akita-shinkansen-operation-status.html
http://www.uk.emb-japan.go.jp/en/event/webmagazine/may11/NEXCO.html
http://www.seejapan.co.uk/JNTO_Consumer/media/Press-releases/press-release-detail/12-02-23/1st-Anniversary-of-the-Great-East-Japan-Earthquake
http://www.seejapan.co.uk/JNTO_Consumer/media/Press-releases/press-release-detail/11-12-07/Japan-Tourism-Back-on-Track-for-2012
http://www.reuters.com/article/2011/11/29/us-japan-michelin-idUSTRE7AS0CL20111129
http://www.tokyo-skytree.jp/english/
http://www.japantimes.co.jp/text/nn20110627a1.html
http://www.uk.emb-japan.go.jp/en/embassy/ambassador/1203.html
http://www.ft.com/cms/s/0/acd1076c-6787-11e1-b4a1-00144feabdc0.html#axzz1oQ7vWJ3x  
http://www.kantei.go.jp/foreign/policy/documents/2012/__icsFiles/afieldfile/2012/03/07/road_to_recovery.pdf