American Airlines Inc. says its pilots' unreliable attendance will force the nation's second-largest carrier to reduce its schedule by about 4 percent and lay off some employees.

Meanwhile, the pilots union has told members to obey a temporary restraining order against the tactics that management alleges have caused delays and flight cancellations.The Allied Pilots Association has denied American's charges that pilots have been staging sickouts, taxiing slowly to waste fuel and filing frivolous requests for equipment maintenance.

But a taped message from APA president Fred Vogel on Thursday advised pilots not to employ "supposedly contrived slowdown devices," or to call in sick if they are not ill, The Dallas Morning News reported.