A so-called "fat tax" aimed at plus-size airline passengers has left travellers furious and feeling "stressed". Major carrier Southwest Airlines has found itself at the centre of controversy over its contentious new policy, which can compel passengers to shell out for an additional seat at its "sole discretion" . The policy change comes after 30 years of letting plus-sized passengers request a complimentary extra seat at the gate, and reimbursing those who purchased one in advance - a practice