... Actually the main hunt didn't get serious until the following Monday if my recollection is correct. More in a bit as I did want to mention a few other facts that the FBI hasn't mentioned much.
Kerm, the Hunt for DB Cooper went something like this:
1. Himmelsbach flew over Ariel (LZ-A) at 9am-9:30am on Thursday. He stayed airborne for about two hours. Visibility was iffy.
2. LZ-A was definitively confirmed on Thursday afternoon, according to Himms.
3. Himms and Oregon NG helos took to the air Friday morning and searched LZ-A further. Visibility worsened.
4. Ground teams went into the Amboy area woods on Friday afternoon, Nov 26 about 1 pm. Buncombe Rd area.
5. Weather worsened Saturday and Sunday but helos found a few breaks in the weather for a bit of minimal recon.
6. All aerial recon called off on Monday in LZ-A.
7. Ground teams were pulled on Monday, too.
8. All fixed-wing and helos diverted for a full-scale survey of Victor 23 from Seattle to Reno on Monday, Nov. 29. Himms flew the left flank of V-23 from PDX to California border. Another fixed winger had the right flank, and a helo took the center of this eight-mile wide corridor.
As far as I have been able to determine, there was no search of DB Cooper's LZ or for his physical presence on Nov 24, either on foot, by car, or in the air. No road blocks and no check points were established, again as far as I have been able to determine.