Amazon.com is sueing online travel outfit Expedia for allegedly failing to cough up $3.66m as part of a contractual agreement between the two companies.

In September 2001 Amazon.com opened the Amazon.com Travel store featuring travel booking services from Expedia.

According to documents seen by Reuters Expedia was due to pay Amazon $16m in 12 instalments as part of the agreement between the two companies.

Expedia has already forked out $3.33m but has failed to pay up a further $3.66m due since February this year. And the documents suggest that Expedia won't cough up the cash unless the contract is renegotiated.

Now Amazon is using the courts to try and get its money, interest on what it believes it should have had, and legal costs. ®