here i am 
it is glass, so make it super transparent = alpha all the way down below 0.05 or so
also the roughness is set to 0.01
in the screenshot some values for a some green tinted glass (don’t look a the texturing, the jetway is work in progress for an upcoming tutorial
the folloing are the values in the glTf
{
"alphaMode" : "BLEND",
"extensions" : {
"ASOBO_material_glass" : {
"glassReflectionMaskFactor" : 0,
"glassDeformationFactor" : 0
}
},
"name" : "jetwayGlas",
"pbrMetallicRoughness" : {
"baseColorFactor" : [
0.5631148815155029,
0.6920716166496277,
0.5983622074127197,
0.02857056073844433
],
"metallicFactor" : 0,
"roughnessFactor" : 0.009999999776482582
}
},
