SEATTLE – The Boeing Machinists union says the aerospace company has delivered a new contract offer.

Union spokeswoman Connie Kelliher said Thursday the company has given a 300-page document to negotiators and they're going over it line-by-line.

The airplane maker's latest offer comes as part of a week of round-the-clock negotiations at a Seattle airport hotel ahead of the current contract's expiration on Sept. 3. Three years ago, the machinists went on strike.