One video taken from what appeared to be inside the United plane showed an engine on fire.
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There are no signs of any survivors.
Boris Johnson pledged to end the sale of new petrol and diesel cars by 2035 - but less than half of the government's fleet is hybrid vehicles.
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Rail costs have gone up by 2.7% on average for 2020 and campaigners say fares are "outstripping people's incomes".
At least 66 people survived the collision, which saw a Bek Air plane hit a two-storey building and concrete fence.
The accident happened between Aylesbury and Flitwick at around 11.15pm.