Old stroller or buggy suitable for flying (West Kensington W14)

Hello freeglers, does anyone have a lightweight buggy they're no longer using suitable for international travel with an infant (newborn size)? A little worse for wear but still reliable, and available within the next week or so would fit the bill. :) Doesn't need to fit in the cabin. We're looking forward to introducing our new little one to our families over the holidays, which will involve four flights (wish us luck...). We were recently gifted a gorgeous one from a generous person here and I'm reluctant to expose it so soon to the rigours of baggage handling! Any guidance on relevant car seats for the buggy also very much appreciated. The options are bewildering to this sleep-deprived mama and our time is short before we travel. Happy to return afterwards if desired. Also happy to receive advice on what to look for on FB marketplace or elsewhere! Many thanks in advance!