http://www.career.vt.edu/JobSearchGuide/Extension.html
In some cases you may need more time than the employer has allowed to make a decision. What to do:
You may ask for an extension; the employer does not have to grant it.
Make sure you have a concrete and appropriate reason for asking for an extension. Expecting to hear soon from another employer with whom you've interviewed is a legitimate reason. If you just hoping to get more interviews, that's not a concreate reason.
Don’t wait until the last minute to ask for an extension; this looks like you don't think ahead and may indicate that you might behave the same way on the job.
Be tactful and diplomatic in your wording. You will need to explain your reasons to the employer. For example, if you have an upcoming, previously scheduled interview with another employer, you may explain that it is important to you to keep your commitment to the other employer, and that in order to make the best decision, you need to attend the other interview.
For the sake of speed, phone the employer to discuss the situation. For the record, you should follow up in writing. Since this is a request that needs to be handled quickly, e-mail is probably the best method to confirm your request. See sample letter below.
What to do when you have one offer, but are hoping to have another that would be your first choice.
Need help? Consult a Career Services advisor — via walk-in advising or an appointment. We are here to help you sort through these kinds of situations.
总的来说, 找理由不是不可以, 但是要灵活掌握。我觉得你老公应该自己做决定要不要接受或者要求延迟那个offer.
small tip, 如果让你飞过去面试并且负担机票和旅馆费的是几十或者几百个人的小公司, 他们90%是要给你firm offer的。也就是说, 如果你希望, 你还可以针对他们的offer谈谈价钱, 当然这总是有风险的。
最主要的因素比较, follow your heart! 湾区说大不大, 说小不小, 其实干你自己手头活的圈子就那么大。