I'm flying bmi (although the carrier is united) to San Francisco in May. I have two economy tickets which i want to try and upgrade to business at the airport on the day of travel. The actual price of business class on the same flight is £6k per ticket today. So I called bmi to gauge what sort of a price it might be for an upgrade and they told me i could upgrade today for £1500 each ticket.
My question is - Assuming there are business class seats left on the day should i expect to pay less than £1500 on the day at the airport?
PS - i am in bmi's diamond club but in name only, i have only 1000 miles as a joining bonus.