JNB-HKG-BOM-HKG-BKK-HKG-NRT-LAX-YVR-JFK-GRU-EZE-SCL-MAD-FRA-LHR-NBO

1. Is this a valid routing, given I pay USD550 for the extra segment in Asia?
2. Do I have any realistic chance of bagging an A class seat in JL NRT-LAX?
3. How would I get from LAX to YVR - can I book into Alaska Airlines?

Many thanks!