MINNEAPOLIS -- The fight between Northwest Airlines Corp. and its flight attendants is about to turn into a fight between their lawyers. Flight attendants announced on Tuesday that they'll conduct random, unannounced strikes beginning at 10:01 p.m. EDT on Aug. 15 unless Northwest backs off the new contract it imposed on them Monday after workers voted down a negotiated agreement. But would a strike be legal? The union says its workers can't be forced to work under terms they didn't agree to. Northwest says it had a bankruptcy judge's permission to impose those terms, and that any strike is barred by the Railway Labor Act, which governs airline labor. Bankruptcy and labor law experts agreed that the apparent contradiction between airline labor law and bankruptcy law hasn't been tested like this before.