IIRC flying LX booking with UA is 80k not 70k. Flying UA booking with UA is 70k.
The easiest way is to book with amex platinum.
I just booked tickets for pesach for 3 people.
Instead of going crazy looking everyday for availability for 3.
I found business with air france for $2,300 that means it costed me 115k points with no fuel.
And I am earning 19k flying blue miles.
After 20 minutes I was fully booked round trip tickets.