Monday, June 9, 2003 | 9:47 a.m.
MINNEAPOLIS -- The battle to lure business travelers back into the air heated up Friday, as Northwest Airlines and American Airlines matched an offer by United Airlines a day earlier.
All three carriers are offering a free ticket to members of their frequent flyer clubs who fly three round-trip flights.
The most deeply discounted fares of all three airlines, those that require a Saturday night stay, are not eligible for the promotion.
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