I always struggled to charge my devices on aircraft - whether I was in D1, C+, etc. using a power plug (as opposed to a USB adapter). Frequently the plugs appeared to be plugged in, but didn't charge my device, and/or charged and then became dislodged, and wouldn't charge etc...
I recently acquired a European iPad charger and wow, with the two long prongs I have had absolutely no issues charging my devices. And, desperate the charge my MacBook the other day, I swapped the little part with the power prongs from the iPad charger to my MacBook charger - and it worked perfectly. Hope this helps everyone out
