The Antonov An-225 is a singularity and
the world's largest cargo aircraft flying today.https://www.cnn.com/travel/article/...e/index.html
... #2 lies unfinished in a hanger near Kiev
One way to collect the An-225 is by the stamps, but good luck finding those Gambian or Solomon Islands stamps GPUP (Genuinely Postally Used on Piece).
While you are waiting, you can create a Google Search on "AN-225" and follow the aircraft as it lands around the world:
You could print news of each 'visit', and attach ancillary items, such as a postcard of that airport / city / ethnography, or related stamps from that country, and build the sort of travel diary that a member of the flight crew might keep.
/s/ ikeyPikey (who has edited this post to correct the aircraft model number)
PS: I cut my finger on my daughter's monster chef-style knife, and she asked: "Do I need to senior-proof the kitchen?"
PPS: Of age-related cognitive decline, I have often said: "Never let them tell you that it is not contagious."