6 hyphen-shaped yellowish-white objects flying as group but shifting positions from NE to SW (Reno-SF) at approx. 35K alt. and 450mph.

From the top of a building in downtown Sacramento I noticed 6 objects in the NE sky towards Reno. All 6 were identical, shaped like simple dashes or hyphens, and were oriented horizontally, (i.e. like the wings of an airplane, not the fuselage). They were the same bright, yellowish-white color as an ordinary light bulb filament.
As they silently flew on a straight, SW path across the sky, they stayed in a tight group, while smoothly and continuously shifting positions in relation to each other.
Their speed and altitude appeared to be very similar to that of an average commercial jet at cruising altitude. It took approximately 1-2 minutes from when I first saw them coming from the direction of Reno until they faded from sight in the direction of San Francisco.
Witness indicates that the date of the incident is approximate.  PD