“Enquiring about the cost of an upgrade may result in a complimentary upgrade if there’s space and the staff are feeling charitable,” explained APH.
“However, although questioning about an upgrade can sometimes work, keep in mind your final destination before asking.
“For example, it’s likely that the majority of an aircraft heading to honeymoon destinations such as the Maldives will be filled with newlyweds hinting for an upgrade and likewise, flights to financial capitals such as Hong Kong will be filled with business travellers in business class seats.”
Travelling alone and checking in late can also boost your chances of sitting in that plusher seat with a glass of champagne.