Seems that many people responded (positively) to the post on JAL’s treatment of guitars on internal flights, so as a way of jumping on the luggage carousel, I thought that I would add some positive recommendations.
For me, the most stressful part of taking a guitar on a flight is the uncertainty that it will be allowed as cabin baggage or not, or that it will be well taken care of in transit in the hold, so here is a list of positive experiences I have had with ground staff and flight crew.