It will be interesting to find out why it failed. Not a big safety issue as both panes are designed to carry the entire pressurization load on their own. Had a cockpit windshield delaminate once between YEG and YVR and of course it was CAT II in YVR. Again, just the outer pane but we did descend to a lower FL to lower the differential.
Southwest flies a lot of ageing 737's and on short hauls so the cycles are quite high. Maybe those windows are getting a bit brittle. I hasten to add they have a very high safety ranking.
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