If I book the following AMS-LHR-JFK-LAX-LAS-LAX-JFK-LHR-AMS could I miss the last LHR-AMS leg?



The last layover at Heathrow is almost 24 hours so would I be able to collect a bag and leave the airport or would my bag be kept somewhere ready for the last leg to AMS the following day?

Is there any risk I don’t get awarded the tier points for the other legs for not completing the full itinerary?