Please send any factual corrections to tips@aspenflyright org for our prompt attention. We’ll correct our publications as needed, and post a log here. Please tell us whether we may acknowledge your correction or you prefer to remain anonymous.

In Essay #2, endnote 36, line 1, for “2002” read “2022”. Thanks to Barry Vaughan.

Essay #2 was accidentally posted in the incompletely corrected draft “ABL-essay_2.Safety_21-Dec-2022r”. As soon as we realized this, on 25 Jan 2023, it was replaced with the corrected final draft ABL essay_2lSafety_22 Dec 2022r.pdf. We apologize for any confusion.

In Essay #3, “Runway robbery?,” posted 29 December 2022, two errors have been marked and corrected in a reposting on 5 January 2023:

– On p 13, paragraph 2, line 6, for “Denver” read “Centennial” and for “23” read “26”.
– On p 25, add at the end of note 70: “Correction added 5 Jan 2023: That comparison appears to have understated certain local and Federal taxes. Taxes on a typical 100-gallon Jet A purchase at ASE in 2021 totaled 47.3¢/gal, nearly half from the 24.4¢ Federal excise tax ( . The FBO’s County sales tax on fuel appears to total 4.0%.

Essay #4, p 7, “2022” paragraph, line 3, for “expert leading the preparation of” read “forecaster for”. Also, note 32 should be replaced by this corrected version:

[32] [1] At, starting at 2:33:39. The quoted remark is at 2:34:15. The speaker, William Flock, is listed as “Director” on the Jacobsen | Daniels website, and was identified (at 40:11 of, 20 April 2023 brief to AAB) as “the forecaster” by Jacobsen | Daniels co-owner and ALP / Fleet Mix Study Project Manager Brad Jacobsen. We erroneously attributed the quotation to Mr. Jacobsen and have posted a correction. We did not correct references to “the County’s top aviation technical consultant” that did not name a person, because that consultant is the firm Jacobsen | Daniels. Please see the posted correction under’s “Corrections” tab for additional details.

Mr. Flock did say last October, and we accurately quoted, that “I think everyone on this call here agrees that the CRJ-700 is going to be flying for the next 20 or 30 years, that it’s not going away.” That appears to be a forecast, not a statement of potential. As stated on p 7 of our Essay #13, Mr. Jacobsen now asserts that the statement should have indicated mere capability, not prediction. The current (20 April 2023) draft Airport Forecast clearly states another two decades (though it doesn’t go further) as a plausible operating capability for CRJ-700s, which airlines may or may not find it economical to exploit; Jacobsen | Daniels now thinks they probably won’t. That doesn’t change Mr. Flock’s apparent prediction last October. Nothing in the 20 April 2023 draft Forecast indicates any need to change our Essay #4’s facts, logic, or conclusions supporting the prospects of long-term operation of CRJ-700s at Aspen. We now feel even more confident that their risks and uncertainties look lower and more tractable than for the EMB-175LR.

On 5 May 2023, in the fourth-from-last line on p 11 of Essay #4, we corrected consultant Alec Seybold’s name (misspelled Alex). We apologize for this error.

On 5 May 2023, we corrected four small typographic errors in Essay #14 (4 May 2023):

– p 10, paragraph 3, line 3, for “is” read “are”
– p 13, paragraph 3, line 3, close up “landing—”
– p 15, paragraph 2, line 3, close up “planes—”
– p 15, paragraph 2, line 5, close up “innovation”

On 25 June 2023, we posted at a corrected version of Essay #15 (so marked in the top line on p. 1). It corrects in red, using strikethroughs and additions, minor errors on pages 8, 13, 17, 17, 18, 21, and 37. None changes the analysis or conclusions.