We are flying to Europe later this year and are flying on a 787-900 series. I want to ask about their boarding as we have (for Now) chosen seats at the back of the plane (Row 36) based on Seat Guru pictures and comments. This is Economy. I am considering paying $132 or so extra to move us up to the Standard Economy section (Row 12, 13 or 14) But do not know if it is worth it. Is the extra dollars worth the space since we cannot get into First or Premium Economy? When does the back of the plane board ?

Thank You