A sample code how to use aviationstack.com rest end points in your solidity smart contract

UseAviationApi.sol

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import '@chainlink/contracts/src/v0.8/ChainlinkClient.sol';
import '@chainlink/contracts/src/v0.8/ConfirmedOwner.sol';


contract UseAviationApi is ChainlinkClient, ConfirmedOwner {
    using Chainlink for Chainlink.Request;
    string public flightStatus;

    bytes32 private jobId;
    uint256 private fee;

    event RequestFulfilled(bytes32 indexed requestId, string indexed data);
    /**
     * Goerli Testnet details:
     * Link Token: 0x326C977E6efc84E512bB9C30f76E30c160eD06FB
     * Oracle: 0xCC79157eb46F5624204f47AB42b3906cAA40eaB7
     * jobId: 7d80a6386ef543a3abb52817f6707e3b
     */
    constructor() ConfirmedOwner(msg.sender) {
        setChainlinkToken(0x326C977E6efc84E512bB9C30f76E30c160eD06FB);
        setChainlinkOracle(0xCC79157eb46F5624204f47AB42b3906cAA40eaB7);
        jobId = '7d80a6386ef543a3abb52817f6707e3b';
        fee = (1 * LINK_DIVISIBILITY) / 10; // 0,1 * 10**18 (Varies by network and job)
    }

    /**
     * @notice Request variable flight status in string from the oracle
     */
    function requestFlightStatus() public {
        Chainlink.Request memory req = buildChainlinkRequest(jobId, address(this), this.fulfill.selector);
        req.add(
            'get',
            'http://api.aviationstack.com/v1/flights?
            access_key=a6656fabf7fbe4fde6e4061f5be7042a&
            flight_number=611&airline_name=Qantas&limit=1' //aviationstack url,use your own access key from aviation stack.com
        );
        req.add('path', 'data,0,flight_status'); // parse the json tree
        sendChainlinkRequest(req, fee); 
    }


    /**
     * @notice Fulfillment function for flight status
     * @dev This is called by the oracle. recordChainlinkFulfillment must be used.
     */
    function fulfill(bytes32 requestId, string memory data) public recordChainlinkFulfillment(requestId) {
        emit RequestFulfilled(requestId, data);
        flightStatus = data;
    }

    /**
     * Allow withdraw of Link tokens from the contract
     */
    function withdrawLink() public onlyOwner {
        LinkTokenInterface link = LinkTokenInterface(chainlinkTokenAddress());
        require(link.transfer(msg.sender, link.balanceOf(address(this))), 'Unable to transfer');
    }
}