Virgin Atlantic claims to be launching the world's first glass-bottomed aeroplane.
The airline tweeted this picture showing how the service will look:
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"You are one of the silence breakers and we all owe you a debt of gratitude."
Maximum temperature 11 C (52 F).
A cut in stamp duty to help first-time buyers is likely to push prices by at least the amount the reduction is supposed to save, MPs said.