One layer as a pilot I would love to see added is an indication of the air temperature-dew point spread. This gives a critical indication of the possibility of airframe icing. I know that this can be derived by looking at the temperature layer and then switching to the dew point layer and then looking at planned flight altitude relative to the freezing level. However it would be a lot more convenient to be able to quickly look at the spread. This is a feature in ForeFlight which is very useful.
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Temperature-Dew Point Spread