Ditto Chris Moss'--similar situation w/a lost passport and ticket 4 days before a RTW with UA and TG.
Find yourself an experienced ticketing agent at the airport or CTO.
Had used the City Tkt Office in Atlanta to book it.
Had to change my day of leaving 1 day earlier to get new passport in Washington. First int'l flight stayed on same day.
The sweet lady at the UA City Tkt OFfice rebooked me without charge and didn't even charge for the lost ticket application.
A bouquet to her!
JL