firecat69 asked on the How many times a year [do you] travel to Thailand thread:
"Do you find it cheaper and available to upgrade to Prem Economy after purchase on KLM rather then purchase it in advance." - and I think it might be a good opportunity for folks to share how they handle upgrades, in case there are suggestions some have thought of and some might not have.
The timing aspect is interesting, but is it less dependable now that more and more flights are leaving without an open seat? I'd be interested in hearing the experiences of others.
I tend to stick with a couple of airlines that go where I often visit, and use their points for upgrades when I can. Now that a few more airlines have joined together (for example a couple of new additions to Star Alliance) it creates more opportunities to gather miles/points. Some use specific credit cards, and some credit cards - such as American Express - can offer credits you can apply, too.
What are your favorites, and why? Shortfalls are also welcome - i.e. mileage that expires quickly.