@Mario ********
people often confuse non O-A visa and a visa extension. And I am not 100% clear in this, but I can tell you, I had a 1 year O-A retirement visa and I never had to do a border crossing, I simply do a 90 day report. Presently, I have a O-A Retirement Visa extension and I do not need to do border runs, I simply need to report every 90 days.