Chevron Lights

I’m a pilot for a US airline. I feel inclined to mention this. I’ve seen a few interesting phenomena that had an explanation. Not sure about this.
My girlfriend, daughter, and I Saw a formation of lights. 7 white lights, perhaps unequal number on one side. Chevron describes it perfectly. It flew in the direction the chevron was pointing. There was a scattered layer of clouds, I verified at 12,000’ from the SJO airport METAR. The object was under the layer of clouds, I’m guessing 11,000’. At first I thought it was a design from a spotlight on the ground projected on the bottom of clouds that movie theaters use, or a more advanced laser projection because it was Halloween. But the lights maintained static brightness even when passing under an area without clouds. It moved flawlessly on track, with no variation. It wasn’t a projection from the ground. It wasn’t a flock of birds. Birds don’t have lights. It was completely silent.
The formation of lights traveled from the southern edge of San Jose to the northern edge in Less than 2 minutes. This distance is about 10 statute miles. 10 miles in 2 minutes is 300 mph. Maybe a Completely silent, flawless formation of jets or a B2 bomber. The angle of lights was steeper than a B2, but wider than an F-117. It was much much bigger than an F-117. Without red beacon lights or strobe lights. I’m going with ETs... I didn’t even think to get a photo lol.