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Published 18:46 16 Jan 2019 GMT
Updated 19:53 16 Jan 2019 GMT

One said: "No jeans or trainers - so I always go for tight black trousers and a blazer or a dress. For men, chinos or trousers and a shirt are worn.
"It definitely helps your chances. When we fly, we have a strict dress code to follow."
Another added that you can't try too hard, and don't have to splash out on any designer goods either.
"For an upgrade, it's all about looking the part. Smart but understated.
"You should look like you travel often. But don't be dripping in designer clothing. It helps; someone who is potentially due to get an upgrade can be knocked back if they aren't dressed suitably."
We might just pop a blazer into our travel luggage so...Explore more on these topics: