There were approximately 20-25 lights or craft moving west to east at 9:20pm. there was no sound, but they looked to be at an altitude of approx. 30k+ feet and they stayed at that altitude. the lights disappeared once they reached the stl area (just east of st. charles). we observed the line of lights from the far west until they disappeared, however their 'disappearance' could have been that their forward lights were no longer visible from the rear. they could have been a division from whiteman afb, but there was no radar identification from flight tracker or planes live. they were in an exact line and were extremely close together. sky's were absolutely clear. a swa flight came in for a landing about 3 minutes after we observed the lights, which did show up on planes live. i'm just curious if anyone else saw this?