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Mr. Hayhoe
asked the Secretary of State for Trade what were the total number of aircraft movements at night at Heathrow in 1975 for jets and for all other aircraft; and how these compare with the figures for the last five years.
Mr. Clinton Davis
The number of movements which took place during the night-time period of restrictions on jet movements is as follows:
| Total Movements by Jet Aircraft | Total Movements by Non Jet Aircraft | |
| 1970 | 7,779 | 6,040 |
| 1971 | 7,801 | 5,827 |
| 1972 | 8,044 | 5,916 |
| 1973 | 5,998 | 6,324 |
| 1974 | 5,040 | 5,776 |
| 1975 | 4,272 | 4,025 |