I'm absolutely sure this is correct.

Standard Tuning (EADGBe)
Capo 4

Intro: Em  D  C - Em  D  C


Verse1:
Em     D               C
  On a plane somewhere again
Em          D            C                      Em
  I take my place in line just like every other time 
         D             C
I slide into my window seat
Em        D            C
  She was sitting there 
                       Em     D               C
One seat over so I said "Hello, how are you today"


Pre-Chorus1:
        D             C       G               D
With my smile I could see the hope within her eyes
      Em                      C           D
And I knew that something was different today


Chorus1:
C        G                D                   Em        C
  Though everything's the same inside there's something real
              G            D                     Em
A faith which causes me to change (but what's different now)
C            G              D                           Em       C
  A spark is gleaming in my eye like diamond stars that fill the sky
          G             D                    Em  D  C - Em  D  C
I think a smile says it all, A smile says it all


Verse2:
Em          D              C
  The conversation presses on
Em         D         C                            Em
  As miles pass below, she said I have to let you know
            D            C
You seem so different to me
Em          D          C
  There's a joy inside
                         Em                   D            C
The love of God is all I know from which this could originate


Pre-Chorus2:
         D             C        G                 D
With one smile I could see, the faith we share inside
      Em                      C         D
And I know that something is different today


Chorus2:
C        G                D                    Em       C
  Though everything's the same inside there's something real
              G            D                  Em        
A faith which causes me to change (but what's different now)
C            G              D                           Em       C 
  A spark is gleaming in my eye like diamond stars that fill the sky
          G             D                    C   G   D - C   G   D
I think a smile says it all, A smile says it all


Bridge:
Bm  G          D         Em
  I see what a smile can say about me
Bm  G           D           Em
  I know that words are not always what speak
Bm    G           D         Em
  Sometimes it's not what I say
         Em              C
That the world around me seems to understand  (chorus)then(outro)


Outro:
                C   G                 D
A smile says it all, (A smile says it all)
                C   G                 D
A smile says it all, (A smile says it all)
                C   G                 D
A smile says it all, (A smile says it all)
                C   G                 D
A smile says it all, (A smile says it all)