I doubt if WN has much excess space in terminals for a lounge. Most of their major airports (where a lounge would be more utilized) are very crowded already. Although, with unknown time for security and baggage lines, many arrive at airport extra early and cool their heels in concourse. Used to be I could time it so less than 30 min in concourse, so not much time there (except for connections). Now more may opt to pay as they are there longer.