Originally Posted by
Dave Noble
Since AMS is not a hub, you may well not be permitted to have a stopover there
The rule states:
You’re allowed one stopover per US Airways itinerary at a US Airways gateway or international destination, or in a partner hub city if you’re traveling on an award partner.
US flies PHL-AMS (and also serves DUB, as does AA). US is also inconsistent in enforcing/interpreting this rule. Typically "US serves this location" has worked in the past. This is more of a problem in the Pacific (since US doesn't fly TPAC).
An alternate stop for a stopover would be DUS or TXL (AB hub), were US phone agents to become excessively concerned about this point.