A Long Journey! Poem by Subramanian Vadakkupattu Krishnan

A LONG JOURNEY!
We are never
starters or enders,
But the part of unending journey,
The set path, on the will of Sender,
King, poor need pay no money,
Men in grave, birds on the trees,
Alongside in the level playing carrier,
Speed, beat Concord's for free-bees,
A few missing but for their barrier,
Traveled millions and millions of miles,
Besides local sojourn to many places,
On one's cost, within the carrier for smiles,
All along, all times same places and faces!

PS: This is a puzzle in poem.
What is the carrier?
What is that level playing free journey?
Who is left out?
A clue to last question - astronauts in the
in the space ship are left out as they
are out of the gravitational region of Earth!