Hello folks. Hope you can offer me some wisdom. I am trying to book a DONE4 but needless to say the booking engine didn't work online.

I was wondering if you can offer advice on who to phone to book this RTW?

Points of consideration:
1. I am UK based and am flying London-London
2. I want to pay with AMEX
3. I want to be able to select seats with oneworld sapphire status

Routing is as follows:

1. LHR-EWR (AY flight no, BA flight)
2. EWR-ORD (AA)
3. ORD-DCA (AA)
4. DCA-MIA (AA)
5. MIA-LAX (AA)
6. LAX-DFW (AA)
7. DFW-OGG (AA)
8. OGG-SYD (QF)
9. SYD-MEL (QF)
10. MEL-AKL (QF)
11. AKL-HKG (CX)
12. HKG-SIN (CX)
13. SIN-NRT (JL)
14. NRT-HKG-DXB (CX)
15. DXB-LHR (IB flight no, BA flight)

Many thanks for advice.