Passengers Max Summerskill (L) and his girlfriend Rebecca Hammond, are pictured at Manchester Airport, in north-west England, on April 28, 2009, as they learn that their flight from Manchester to Cancun in Mexico has been cancelled following a travel advice warning from the British Foreign Office. The global airline and travel sectors battened down the hatches Tuesday for a possible swine flu pandemic which could deal another blow to two industries already reeling from the economic crisis. As images of people wearing face masks in public resurrected grim memories of the SARS health scare in 2003, analysts appealed for calm, saying it was too early to speculate on the impact of the new threat. AFP PHOTO/ANDREW YATES (Photo credit should read ANDREW YATES/AFP/Getty Images)