Last month I flew on Delta PBI>ATL>FCO round trip using Skymiles cheapest redemption level which does not include checked bag or seat choice. On each leg of the flight there was an announcement at the boarding gate that because the aircraft was at capacity, anyone who was willing to check a bag could do so and it would be “absolutely free.” On international flights with a change of planes, I always try to check my bags because I don’t like fighting my way down the narrow aisles or dragging it from one gate to another.
The odds of your luggage being lost have been drastically reduced in the last few years. On 22 international flights I’ve only had 2 bags go astray. Because of equipment problems a quick re-routing from Delta to Air France made for a very tight (less than 40 minutes) connection in Paris. I arrived in Venice and my bag didn’t. I checked into my hotel, enjoyed a pizza and vino, took a short walk and returned to my hotel and my bag was in my room. Easier than dragging on a vapor et to! On a flight from Florence to Miami, there were major delays and my bag went missing. Basically filled with dirty laundry and nothing important, it was delivered to my home 5 days later. Both incidents happened over 18 years ago. No problems since and I don’t feel like a pack horse.