I did and got the response like others reported. But when I went back it said it could not process the application at this time and to retry later. That doesn't mean the offer is over. I did get a number to apply so I may call and see what they say.

UPDATE:
I called Chase Lending to see if my application went through. They were unable to locate it so I explained I was concerned the offer for 60K miles expired. She did a lot of digging and came back and said the offer was still alive. She wouldn't tell me when it expires but said I should try back in a couple hours. She did say since it was 60K miles she thought it would be a short promo. I'm taking her advice and trying to get this before it's too late. Also, I called the number they gave earlier and they could only offer the regular 40K promo. She said the 60K is available online only.