This could take a long time. If the domain registrar and the hosting company are the same, they will drag their feet on making the change. Until the registrar makes the changes to their database, the internet servers will not be updated. So far the registrar has not made any changes to it's database for the "airlinemogul.com" domain.
When I do it, it does not take more than 24 hours (yes, I own an ISP and hosting company.)