Sunday $1M - flopped straight draw bet is check-raised

[WinBig]

Sunday $1M this afternoon with blinds at 400/800 and a 50 ante. I raise to 2400 UTG with AQ offsuit and a stack of 18K. I was not raising a lot so I probably had a tight image. Folded to the BB with a stack of 60K who calls.

Flop is JT9 with two hearts and I have the A of hearts. He checks, I bet 3200 and he check-raises another 8000 to 11200. The BB had raised UTG earlier with AJ offsuit and shoved a J high flop so I'm not sure how much I can narrow down his range.

There is 20K in the pot and a call would leave me only 4K so my decision is to push or fold. I have zero fold equity so does an open-ended straight draw warrant a push or is this an easy fold?

Results in white: <font color="white"> I called and he showed KQ of hearts for the flopped straight and his flush hit on the river. </font>