Hello I need some advice.

Next summer (july 2015) I want to go from AMS to Honolulu.
I see there is no change to have for a stopover (AA en BA does not allow this)
What is your advice?
Is this still possible with US Airways? They got a nice route (AMS-LON-Phoenix-Honolulu) In First class this will earn a lot of points.
I only want to a stop over in Phoenix for a 2 weeks roundtrip with the family.

AMS-HON=18 july 2015
HON-PHX = 22 july
PHX-AMS= 10 august( 3 a 4 days flexibel)

With greetings.