As expected, JAL Flight Crew Union called off the planned strike on June 19 2013 in the last minute. All JAL domestic and international flights will be operated as a result. Below is the update posted on Japan Airlines website.

Japan Airlines flight crew union was unsatisfied with the reply from company concerning their requirements to the current wage system and announced to call a 24-hour strike on June 19, 2013.

The strike has been averted by negotiation.

All domestic and international flights will be in normal operation on June 19, 2013.
We sincerely apologize to all customers and related parties for the inconvenience and concerns caused by this issue.

JAL posts a notice on its website informing passengers of the planned strike.

[Update: The planned strike has been canceled]

JAL Flight Crew Union plans to strike for 24 hours on June 19 2013 as it is not satisfied with how Japan Airlines (JAL) replied to its demands. The planned strike will only affect domestic operations and as of right now, JAL has canceled some of its domestic flights on that day and has issued a special refund and cancelation policy.

Update: The planned strike was cancelled and no flight operations will be affected.

JAL's smaller cabin attendant union plans to strike on Dec 24 and 25.

JAL has ~5400 CAs and this union only consists of ~870 CAs. Not sure about how this will impact JAL operations but during previous strikes, only domestic operations were affected and sometimes the unions even cancel the planned strike.

There will be the monthly JAL press conference today, in which JAL plans to announce the approval of the restructuring plan by the Tokyo District Court. Might have more information after the press conference.

I would say you have nothing to worry about for now if you are traveling internationally during that period of time.

Source: SankeiBiz (in Japanese)

As reported earlier, Japan Airlines (JAL) plans to shut down its Osaka (Itami) and Fukuoka cabin attendant bases and move all cabin attendants to Tokyo in June. JAL's Cabin Crew Union (CCU) held a press conference yesterday and officially commented on this change. Of course, they are not happy about it.

Japan Airlines has posted a warning of possible strike on its website. Four unions including the pilots, cabin crew, and ground staff plan to strike on June 17 2009 for different durations due to dispute on the summer bonus.