Be careful!... specially purchased tickets might not have the same-day-of-travel standby rule. I was flying and my cheapo company(a $200 billion company!) bought tickets with a specially negotiated deal. Those cheapos bought a ticket so low that I was not permitted to fly any flight except the exact one ticketed(no same-day standby), and this on on a full-fare carier with many daily flights. Usually even the lowest bargain fares at least allow same-day travel, but special fares can have unusual restrictions.