BTS logs show similar anomalies for N612UA, the United Airlines Boeing 767-200 that presumably crashed into 2WTC on 9/11/01 at 9:03.

E.g., on 9/7/01, UA Flight 845 (N612UA) took off from JFK at 9:13 and landed at SFO (San Fran) at 12:07. UA Flight 170 (N612UA) then took off from SFO at 13:57 for BOS (Logan) and landed there on 9/7 at 22:57. Then, there is no "official" BTS record of any activity for N612UA out of BOS on 9/7, 9/8, 9/9 and 9/10/01. The aircraft was apparently out of service for three days. Then, on 9/11, N612UA was used for UA Flight 175, which took off for LAX at 7:58. 

However, on 9/10/01, UA Flight 845 (N612UA-according to BTS records) took off from JFK at 9:11 bound for SFO and landed there at 12:11. N612UA then departed SFO at 13:30, bound for BOS(???), and landed there at 21:57, a repeat of the sequence of flights that occurred on 9/7/01. 

This was a strange occurrence, though, since N612UA had never "officially" left BOS after it landed there from SFO at 22:57 on 9/7/01 until the morning of 9/11/01!!