Some Korea-era jets could be jump-started using exhaust from a jet in front of you. I think this lost favor with the bosses (but it was cool). Most turbojets will air-start with enough airspeed to windmill the engine, often possible in level flight in a 2-engine jet. High bypass turbofans require much higher airspeeds (like 300-400 KIAS) to achieve restart RPM in the core (dive, baby, dive). Multi-engine transports can normally restart using bleed air from a good engine to spin up a dead one. Some old-timers here will recall cartridge starts, very smoky. Jets are not like piston engines. If they reach the spec RPM and don't start there is probably something wrong (maybe the operator).
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