Apologies in advance if this question has already been answered, but I can't find any information about this.

I was doing some searching at jetblue.com for flights from SFO-LGB with the new service, and noticed that B6 204 operates a morning departure through November 3rd when the 3 daily flights begin. Flight 204 continues on to JFK, so I'm assuming it has to be a A320, while I know that SFO-LGB will normally be operated with a E190.

The other flight currently on the route carries the flight number 1436, and it appears that after 11/3 all of the flight numbers are in the format 1xxx. My question is do the flight numbers here correspond to aircraft type (ie, does a 1xxx flight number always mean an E190?) or is this just a coincidence related to the start of SFO-LGB service?

Thanks!

When we first got the E190s, yes, the flight number corresponded with the aircraft type. A four digit flight number entailed an E190 and a three digit flight number a 320. Now, it does not mean a thing. Aircraft are routinely swapped for the operation and/or for customer demand. A perfect example of this is PWM. In the summer PWM is operated by a bunch of 320s, while in the remaining months it's predominantly E190. The flight numbers do not change with the swap.

You are correct with flight 204, it is a 320, the next day the service switches to all E190.

204 from SFO will be an A320 until we go to three-flights a day (SFO-LGB) then all will be an E190.

That same A/C goes to New York, and actually returns to LGB as JB217.