Something like: ``` let IATA_LOOKUP export default { async fetch(req, env) { if (IATA_LOOKUP

let IATA_LOOKUP
export default {
  async fetch(req, env) {
     if (IATA_LOOKUP === undefined) {
       IATA_LOOKUP = await env.KV.get('iata.json', { type: 'json' })
     }
     // process using IATA_LOOKUP
     return new Response(...)
  }
}

let IATA_LOOKUP
export default {
  async fetch(req, env) {
     if (IATA_LOOKUP === undefined) {
       IATA_LOOKUP = await env.KV.get('iata.json', { type: 'json' })
     }
     // process using IATA_LOOKUP
     return new Response(...)
  }
}