A thing that I don't understand

Maybe this question is dumb, but their's a thing that seems weird to me, their is static A320 and B737 and I even seen an ATR 72 at Geneva with United or American Airlines etc... but howcome those aircraft can reach Geneva or Amsterdam from the US

Haha I had fun picturing in my mind a 737 or a 320 with a air-refueling probe fixed with adhesive tape, And even if they had a ride in a Beluga, It never has been concepted to cross the atlantic