I'm jealous you actually remembered and did something about it! I was telling my kids about the two milestones i was heading into 2,000 flights and 3 million miles. They we excited and wanted to plan something, my youngest as even going to bake a "plane cake". But alas, hit a horrid work period that even my bum was taking the shape of a business class seat!
Kids were not impressed when i told them later they were done. Even worse i could not even remember which ones they were! But for the record i just went back and had a look and i did them both in a 6 week period, TPE > LAX was the 3 millionth mile somewhere over the Pacific and the 2,000th was BKK to IST and from memory a flight to forget.