that I belong to that scenario, which is AC21 enables h1b with approved I-140 petitions who are unable to file adjustment of status because of no available visa number...
i know under that situation, h1b extension would be made in increments of up to 3 years...
I was in another sceario which is 365 days or more have passed since the filling of LC, in this catogary , h1b only can get extention on incremeat a 1 yeat a time,,,I just concurrent filed 140 along with 485 recently...confusing....