Assuming its got nothing to do with any airline or airline aircraft?
That's easy - the freedom. Real pilots will know what I'm talking about.
Umpteen thousands of hours and yet I'll still count down the minutes to
when I take me PA18 out to a quiet patch of late afternoon sky and do a
few stall turns and wingovers and other fun stuff, and because of that of
course I'm always chasing last light back to the field.
For a mate's DH82 I literally count down the seconds like a kid who's told
in the morning he'll be let out of school early!