From reading these posts it seems as if the more affordable option for upgrading from economy to business is not to take advantage of paid upgrades proffered when checking in online or at a kiosk but to wait and ask to purchase an upgrade once on board. I never even knew this option existed until now. How would one go about requesting this? Would one wait until after take-off when things have quieted down or make the request when walking on board? I will be flying MCO to FRA on Lufthansa.
Thank you for any insight you are willing to share.