Can You Check My Relationships

http://www.londonheathrowcars.com/rels.jpg

basically this is a system for a cab office.

the BOOKER and the LEAD PASSENGER will both come from the PERSON table.

the PICKUP and the DESTINATION will both come from the PLACE table.

if a JOB is a cash job, it wont involve a PAYMENT, if it is a credit card job it will.

a JOB may have more then one PAYMENT (eg, 2 passengers paying £30 each on their own cards)

each PAYMENT will involve one CREDIT CARD

a PAYMENT might pay for more then one JOB

a JOB may or may not belong to an ACCOUNT

a JOB may or may not belong to an INVOICE

an INVOICE will involve one or more JOBS

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the rest is fairly straightforward..

the only issues are if we are picking up 4 passengers.. we have decided to limit the system to only register a LEAD PASSENGER..the same problem is with the PICKUPS and DESTINATIONS. there might be 4 pickups.. each pickup picking up a different passenger, and then 3 drops dropping 2 passengers in 1 place.. etc..

we have avoided this because its not really THAT important..

can anyone see any other problems with this layout?