John and Nizzette Conlon and their two sons, all Islanders fans from St. James, N.Y., walked to their seats in Section 3 at the southwest end of Barclays Center and took one flabbergasted look.

“What is this?” Nizzette said.

John just laughed.

Their seats for Friday night’s preseason game against the Devils, which the Islanders won, 3-2, in a shootout, were suspended right above one end of the rink, only 20 feet up, blocking their view of the ice directly below them. In fact, that entire section of the rink — from the face-off dots to the end boards — was blocked from the fans’ sight.

The Conlons were not alone in their plight while attending the Islanders’ only visit this season to Barclays Center, their future home. The view from several hundred other seats at one end of the rink was also obstructed, though arena officials said many of those would not be offered for sale when the team starts play there next year.