Design, Economic Competitiveness, and Profitability of a 2025 LNG Fueled Turboprop for the LNG Air Transportation System

This paper describes the technical characteristics, lifecycle emissions and economic competitiveness of a hypothetical liquid natural gas (LNG) powered turboprop when introduced into a market place with both existing turboprops and potential competitive responses between 2025 and 2030. Natural gas possesses vast potential to reduce emissions and improve operating costs in commercial aviation because it is cheaper and cleaner than jet fuel. The results show that LNG turboprop can completely robustly against current turboprops (ATR-72 and Bombardier Q400), the competitive responses of stretched derivative of the Q400 to 90 seats, and against discounted used version of current turboprops. Specifically, the LNG turboprop can achieve between a 9% and 15% operating cost advantage compared to current turboprops, 4.9%-8.9% against a stretch of the Q400 turboprop, and, a 3%-11% advantage against existing turboprops sold or leased at steep discounts. The program is shown to be profitable and yield a positive internal rate of return on invested capital between 9% and 17% if market share levels between 47% and 75% are achieved

astropy/astroquery: v0.4.5

What's Changed Update Spectra URLs by @weaverba137 in https://github.com/astropy/astroquery/pull/2214ALMA integration tests fix by @andamian in https://github.com/astropy/astroquery/pull/2224Fix doc build issues by @bsipocz in https://github.com/astropy/astroquery/pull/2226Allow retrieval from a previous ESO archive request by @gbrammer in https://github.com/astropy/astroquery/pull/1614Turn off default verbosity for TapPlus by @bsipocz in https://github.com/astropy/astroquery/pull/2228Refreshing content of RTD config by @bsipocz in https://github.com/astropy/astroquery/pull/2229NED: String has to remain raw by @bsipocz in https://github.com/astropy/astroquery/pull/2230eJWST prelaunch by @jespinosaar in https://github.com/astropy/astroquery/pull/2140MNT: Cleanup of old unused code and configs by @bsipocz in https://github.com/astropy/astroquery/pull/2231Adding changelog rendering to narrative docs by @bsipocz in https://github.com/astropy/astroquery/pull/2233Mast cloudaccess docs update by @jaymedina in https://github.com/astropy/astroquery/pull/2235eJWST release by @jespinosaar in https://github.com/astropy/astroquery/pull/2238eJWST: remove disclaimer for release by @jespinosaar in https://github.com/astropy/astroquery/pull/2243Fix to allow html downloads with alma package by @andamian in https://github.com/astropy/astroquery/pull/2246Deprecate astroquery/utils/download_file_list.py by @eerovaher in https://github.com/astropy/astroquery/pull/2247Expand contribution guidelines by @keflavich in https://github.com/astropy/astroquery/pull/2248Fix for issue #2237: do not cache results that cannot be parsed. by @mkelley in https://github.com/astropy/astroquery/pull/2253Adding python 3.10 to CI by @bsipocz in https://github.com/astropy/astroquery/pull/2186 New Contributors @gbrammer made their first contribution in https://github.com/astropy/astroquery/pull/1614 Full Changelog: https://github.com/astropy/astroquery/compare/v0.4.4...v0.4.