ETE vs ETA - oh my

ETE/ETAs

We are committed to providing our requestors with the most accurate
ETE possible, so that you can focus on the patient, not when your
transport will arrive.

Air medical transport ETE (Estimated Time Enroute) is a best estimate
for when you can expect your transport to arrive. Receiving an ETE
means that dispatch will add estimated lift time and flight time to
give you a number of minutes that you can expect our aircraft to
arrive. Only receiving part of this equation can lead to misleading
transport timing.

from https://www.airmethods.com/arch-air-medical-570456/

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lets make this even more confusing

whats the difference between 'estimated time of arrival' versus
'estimated time TO arrival'

such as - ETA of 20 minutes - vs - ETA of 1500