Lewisc said:
Don't most airlines offer complimentary and/or discounted first class upgrades to their "elite" passengers before offering it to "regular" customers?
Yes. For example, American gives unlimited complimentary upgrades on a space-available basis to Executive Platinum members, while Gold and Platinum members earn four 500-mile upgrades per 10,000 miles flown, and they can buy more upgrades for a modest price. On routes that primarily serve business travelers, a non-elite member has almost no chance of getting an upgrade because there are many elite frequent flyers on each flight.
However, on routes that serve primarily leisure travelers, the percentage of elite frequent flyers is much lower. Also, when an elite member is flying with more than one companion, the elite member can't upgrade. So the airlines have an opportunity to sell upgrades at the airport to anyone who will pay a fee. When an economy passenger uses an American Airlines kiosk for check-in, the kiosk might offer an upgrade for a modest fee (often less than $100 per seat). The price is based on the distance. On American, this is a recent change.
Delta offers same-day standby upgrades. See
http://www.delta.com/traveling_checkin/ticket_changes_refunds/sameday_travel_changes/index.jsp here's what it says:
The same-day standby upgrade option allows you to upgrade your flight for a small fee provided space is available and your ticket is eligible. The following upgrade fees apply:
0 to 500 miles $50
501 to 1,000 miles $75
1,001 to 1,500 miles $100
1,501 miles and up $150
Delta's upgrade policy for Medallion (elite frequent flyer) members is at
http://www.delta.com/skymiles/about_skymiles/benefits_at_glance/upgrades/index.jsp so, given this generous upgrade policy, it's unlikely that upgrades will be available on flights with many elite members onboard. However, on flights to Orlando, especially on weekends or when there isn't a big convention in Orlando, an upgrade (for a fee) is a real possibility.
In any case, it doesn't hurt to ask at check-in.