Wall Street Journal Editorial:

Teachers unions routinely claim that the interests of students are their top priority. So we would be interested to hear how the Pennsylvania affiliate of the National Education Association explains the proliferation of teacher walkouts in the middle of the school year.
According to a recent study by the Allegheny Institute, Pennsylvania is once again the worst state in the country for teacher strikes. No less than 42% of all teacher walkouts nationwide occur in the Keystone State, leaving kids sidelined and parents scrambling to juggle work and family, potentially on as little as 48 hours notice required by state law.
The strikes take place despite the state’s ranking in the top 20% nationwide for teacher salaries in 2006-2007 — the most recent data available — with an average of $54,970. Those paychecks go even further when adjusted for the state’s cost of living compared to top-spending school districts in places like California.