I'm posting this more out of idle curiousity than anything else.

Playing around with the QR booking facility just now I noticed something I haven't seen before in the passenger category. If I select:

From: LHR
To: MNL or CRK

no fewer than FIVE different passenger categories are displayed:

- Adult
- OFW (Overseas Filipino Workers)
- Teenager
- Child
- Infant

From a fare point of view I thought that only Adult, Child and Infant mattered. I know OFWs have their own line at MNL passport control, but what other reason would QR have for this differentiation?