Date oct 24, 2016 estimated 9:30am central us time. observer location: balcony (8th floor-pool level) at hotel habita in the city of monterrey, nuevo leon, mexico observer location coordinates: latitude:25.6512 / longitude:-100.3677 observer activity at the time of sighting: sight-seeing (visiting family) sighting date/time: 10/24/2016 – approx. 9:30 am day conditions: partly cloudy sky; sun shining from the east. incident description: looking due north from observer location at a distance estimated to be 15 to 20 miles. i first believed to see two white balloons aimlessly drifting upward rising from the area of a mountain in the distance. after carefully viewing the ascent of said objects, i realized the rate of ascent was too fast to be balloons, and the direction was too straight upward to be in fact balloons. the sighting was followed for about 1 to 2 minutes until both objects were lost into the cloud cover. my friends viewed a third identical object, but i did not see it. they mentioned the three objects were in a triangular formation. i was not able to evidence this formation. not knowing what i saw has made me want to write this submission.