[gruez]

>In particular anyone who does 'mileage runs' and emits huge amounts of CO2 just so they have the 'privilege' to sit in a slightly nicer chair in a dull airport lounge.

I doubt anyone is doing this? At best they're grinding out flights so they can get free first/business class seats later.

[Archonical]

People do this to meet minimum requirements for mileage tiers, e.g. I know someone who was close to Diamond status on Delta and went to Miami and back without leaving the airport area just for the miles.

[gib444]

Look on the Flyertalk BA forum 2005-2020. Was a huge thing and not always for upgrades, because BA have been stingy with upgrades for a long long time. Lounge access/baggage/priority boarding etc was a huge part of it

Popular mileage runs were London to Honolulu with lots of sectors on the way iirc !!