Don't Use A Carrier Pigeon To Propose Marriage Day!
I know you're looking for something unique that she'll never forget. And a carrier pigeon landing on her table at Sunday brunch with a note tied to its talon would be a great story to tell. And it will make you sound like an interesting person, which is after all the point. But you mustn't trust trained birds. A trained bird is only as good as the next task it completes without straying from its training, and the day it strays from its training is the day it goes for the eyes. You'll blind her and disfigure her.
Now I think plan A is the way to go. Your girlfriend is the pilot of the Channel 5 Traffic helicopter and you know exactly where her rush hour flight path will take her. So spraypaint, "Will You Marry Me, Beth?" on the roof of your Honda and hit the freeway. It'll be on TV!
Happy Don't Use A Carrier Pigeon To Propose Marriage Day!