I have an award flight to SE Asia on KE in J departing from JFK, but I live in ATL. I wanted KE's A380 and flat bed as opposed to there inferior product to ATL. When I booked the flights there was no low availability ATL-JFK, so I didn't book that leg. I've been looking every day for a month and LOW has not popped up on the award calendar, and it hasn't changed for any of the Saturdays in March (my departure day.) However, LGA is wide open on my dates, and there is low availability flight which gets in three hours before my JFK departure. Can I add the LGA flight without skyrocketing the price? Could I add an ATL-JFK Y flight without increasing the price? I'm Delta PM.