You could use:
Code:
Sub Demo()
Application.ScreenUpdating = False
Dim Tbl As Table, i As Long
For Each Tbl In ActiveDocument.Tables
With Tbl.Range
For i = .Cells.Count To 1 Step -1
.Cells(i).Range.Select
If Len(.Cells(i).Range.Text) = 2 Then .Columns(.Cells(i).ColumnIndex).Delete
If i > .Cells.Count Then i = .Cells.Count
Next
End With
Next
Application.ScreenUpdating = True
End Sub