I did a CC purchase for a new CAT for my 911 a week ago for $450 it got denied online. Literally about 10 seconds later I got a text message from Chase asking if I had authorized the purchase, "press 1 for yes, 2 for no" Pressed 1 and got a text message saying re-try the purchase. It went right through.
On my CITI corporate card with Disney, I have a huge line of credit. I booked with less than 24 hours, two 737's to evacuate over 500 cast and crew from NOLA just before Hurricane Katrina for the features
Deja Vu' and The Guardian. The hit to my CC was something like $400,000, but I got the mileage credits.
IIRC we got two round trip tickets to Prague out of the deal.