1.   At its core, their dispute hinges on how much American, Southwest and other airlines will contribute to the federal government to keep the aviation system running.

2.   But the dispute also hinges on language.

3.   The dispute hinged on whether federal law governing court-appointed receivers should take precedence over California property laws.

4.   The dispute hinged on whether courts should make a distinction between professional groupsat arepartnerships and those that are set up as corporations.

5.   The dispute hinges on whether this is the last year which money can be appropriated for the project.

6.   The high court dispute hinges on an important distinction in antitrust law.

7.   The dispute now hinges on a ruling by a commercial court on whether to lift an injunction stopping the ship from leaving port.