Chinese · Pronunciation Guide
fay-JEE, both syllables high and flat. An ordinary f, then an unaspirated palatal j with no puff of air.
fēijī
Both syllables sit high and flat with no pitch movement whatsoever. That stability makes it a useful reference word, and it also means the compound leaves everything around it alone: a dipping tone before it keeps its full descent, and the negator stays as bù.
Listen: 飞机
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飞机一个小时后起飞。
Fēijī yí ge xiǎoshí hòu qǐfēi.
The plane leaves in an hour.
Listen: 飞机一个小时后起飞。
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飞机一个小时后起飞。 contains a 一 conversion — yí before the underlyingly-falling ge — and then xiǎoshí with a dip and a rise, hòu falling, and qǐfēi with a dip and a level. Note xiǎo keeps its dip because shí rises, and qǐ keeps its dip because fēi is level. Two unchanged dipping tones and one converted 一.
Aspirating the j gives qī, a different word. Keep the breath in. On the tone side, English speakers stress the first syllable of a compound noun and let the second fall away, which turns jī into a fourth tone — both need the same height. And the diphthong in fēi tends to get drawled out like English "fay".