El Salvador, playing at high-tempo and making good use of the flanks, drew level 10 minutes later with a magnificent curling 25-yard free-kick from Zelaya.
Rafael Burgos hit the post for the Salvadorians four minutes before the interval but they went ahead in the 69th minute when Zelaya met a perfect cross from Darwin Ceren with a fine diving header.
The lead lasted just four minutes before striker Jones took a long ball down on his chest, broke goalwards and fired in a powerful left foot shot.
Both sides continued to pile forward and Zelaya almost had a hat-trick and the winner with an acrobatic effort that was tipped over the bar by T&T goalkeeper Jan Michael Williams.
In the later match Haiti, fresh from last month's draw with Italy and narrow 2-1 loss to Spain, paid the price for their lack of sharpness in the final third.
Haiti played plenty of positive attacking football but invariably their moves broke down near the penalty area or ended with hasty finishing.
One of their best chances came in the 20th minute when Jeff Louis crossed to an unmarked Leonel Saint Preux only for the striker to blaste over the bar.
The Hondurans rode their luck a little in the second half but made sure of the win with 12 minutes remaining when Marvin Chavez finished off a low cross from Bryan Beckeles.
Tuesday sees the start of Group C action with Costa Rica against Cuba and hosts USA meeting Belize in Portland.