Wonder why cabin crew always look immaculate? That’s because they’re disciplined if grooming standards aren’t followed to the letter. Skirts can’t go above the knee, heels must not be higher than three inches, lipstick has to be a certain shade of red and constantly applied, and nails must always be manicured with only pink, red or French polish. Some airlines have also been known to check the colour of your bra before a flight, so being on your best beauty behaviour is a must.